{"id":28781,"date":"2026-07-11T22:40:12","date_gmt":"2026-07-12T06:40:12","guid":{"rendered":"https:\/\/www.blindsgalore.com\/blog\/?p=28781"},"modified":"2026-08-13T22:27:25","modified_gmt":"2026-08-14T06:27:25","slug":"can-venetian-blinds-block-out-light-completely","status":"publish","type":"post","link":"https:\/\/www.blindsgalore.com\/blog\/index.php\/beyond-basics\/can-venetian-blinds-block-out-light-completely\/","title":{"rendered":"Can Venetian Blinds Block Out Light Completely?"},"content":{"rendered":"<div class=\"wpb-content-wrapper\">[vc_row][vc_column][vc_column_text css=&#8221;&#8221;]<span style=\"font-weight: 400;\">Venetian blinds cannot block out light completely. Even when fully closed, the horizontal slats leave small gaps at the cord routes, along the edges of the window, and between the slats themselves where light slips through.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Venetian blinds are excellent at controlling light, reducing glare, and providing privacy, but they are not a blackout treatment, and no amount of adjustment will make them one.<\/span><\/p>\n<h2><b>Why do venetian blinds leak light?<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">Venetian blinds are built from horizontal slats held together by lift cords and tilt mechanisms. Three features of that construction create gaps that let light through even when the blind is fully closed.<\/span><\/p>\n<h3><b>Cord routes and ladder holes<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">The lift cords run through small holes or notches in each slat. When the slats close, the cord holes remain open, creating pinpoints of light along the length of the blind. Routeless designs eliminate these holes and improve light blocking significantly, but even routeless slats cannot seal completely at the edges.<\/span><\/p>\n<h3><b>Gaps between slats<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Each slat overlaps slightly with the one above and below it when closed, but the overlap is not airtight. On wider blinds, slight variations in slat alignment create slivers of light between the rows, especially after years of daily use. \u200b<\/span><a href=\"https:\/\/www.blindsgalore.com\/faux-wood-blinds\"><span style=\"font-weight: 400;\">Faux wood blinds<\/span><\/a><span style=\"font-weight: 400;\"> with wider, thicker slats overlap more securely than thinner aluminum or vinyl slats, which is why they block more light, but not all of it.<\/span><\/p>\n<h3><b>Edge gaps at the window frame<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">A standard inside-mounted blind sits within the window frame with a small gap on each side to allow the blind to raise and lower freely. That gap lets light leak around the edges, especially on south- and west-facing windows with strong afternoon sun. The guide on \u200b<\/span><a href=\"https:\/\/www.blindsgalore.com\/blog\/index.php\/beyond-basics\/hello-sunshine-goodbye-glare\/\"><span style=\"font-weight: 400;\">Hello Sunshine, Goodbye Glare<\/span><\/a><span style=\"font-weight: 400;\"> covers how different mounting approaches manage edge light.<\/span><\/p>\n<h2><b>How to block more light with venetian blinds<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">If replacing the blinds is not an option, a few adjustments improve venetian blinds light blocking without changing the treatment entirely.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Choose a routeless design. \u200b<\/span><a href=\"https:\/\/www.blindsgalore.com\/product\/782602\/blindsgalore-privacy-faux-wood-blinds\"><span style=\"font-weight: 400;\">Privacy faux wood blinds<\/span><\/a><span style=\"font-weight: 400;\"> eliminate cord holes from the slats, which removes the brightest pinpoints of light and creates a tighter close. The difference between routeless and standard is visible immediately.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Use an outside mount. Mounting the blind wider and taller than the window frame covers the edge gaps that an inside mount leaves exposed. An outside mount does not eliminate edge light, but it reduces it meaningfully.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Pick wider slats. Two-inch or wider faux wood slats overlap more than one-inch aluminum or vinyl slats, which blocks more light between the rows. The wider slat also reduces the total number of gaps across the window. For a comparison of how \u200b<\/span><a href=\"https:\/\/www.blindsgalore.com\/window-blinds\"><span style=\"font-weight: 400;\">window blinds<\/span><\/a><span style=\"font-weight: 400;\"> in different materials handle light, the full category shows the range.<\/span><\/p>\n<h2><b>What treatments deliver true blackout?<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">For venetian blinds for bedroom darkness or any room where complete darkness matters, a different treatment is the honest answer. Three options handle blackout far better than any slatted blind.<\/span><\/p>\n<h3><b>Blackout roller shades<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">A single panel of dense blackout fabric blocks close to 100% of the light through the shade itself. Roller shades deliver the cleanest blackout solution with the slimmest profile. The \u200b<\/span><a href=\"https:\/\/www.blindsgalore.com\/blackout\"><span style=\"font-weight: 400;\">blackout<\/span><\/a><span style=\"font-weight: 400;\"> collection covers the full range of fabrics and colors.<\/span><\/p>\n<h3><b>Blackout cellular shades<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Honeycomb shades with blackout fabric block light and insulate the window at the same time. The honeycomb pockets trap air for thermal efficiency, and the operating cords run inside the cells so there are no cord holes leaking light. For bedrooms where both darkness and temperature comfort matter, blackout cellular shades are the strongest choice.<\/span><\/p>\n<h3><b>Layering venetian blinds with blackout drapery<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">For homeowners who love the look of venetian blinds and do not want to replace them, layering \u200b<\/span><a href=\"https:\/\/www.blindsgalore.com\/custom-drapery\"><span style=\"font-weight: 400;\">custom drapery<\/span><\/a><span style=\"font-weight: 400;\"> with a blackout lining over the blinds solves the light problem without removing the treatment. The blinds handle daytime light control and privacy, and the blackout drapes close over them at night for full darkness. For a broader comparison of blind materials, the guide on<\/span><a href=\"https:\/\/www.blindsgalore.com\/blog\/index.php\/beyond-basics\/bamboo-vs-wood-blinds\/\"> <span style=\"font-weight: 400;\">Bamboo vs Wood Blinds<\/span><\/a><span style=\"font-weight: 400;\"> covers how different constructions handle light and durability. For more layering strategies, the \u200b<\/span><a href=\"https:\/\/www.blindsgalore.com\/blog\/index.php\/for-your-inspiration\/the-ultimateguidetowindowtreatments\/\"><span style=\"font-weight: 400;\">Ultimate Guide to Window Treatments<\/span><\/a><span style=\"font-weight: 400;\"> covers how to combine treatments effectively.<\/span><\/p>\n<h2><b>The honest answer for bedrooms<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">Can venetian blinds block out light completely? No. Can they reduce light and glare significantly? Yes, especially with routeless slats, wider faux wood construction, and an outside mount. For rooms that also care about rental-friendly practicality, the guide on the<\/span><a href=\"https:\/\/www.blindsgalore.com\/blog\/index.php\/beyond-basics\/best-blinds-for-airbnb-and-vacation-rentals\/\"> <span style=\"font-weight: 400;\">Best Blinds for Airbnb and Vacation Rentals<\/span><\/a><span style=\"font-weight: 400;\"> shows how blackout shades fit multi-property setups. For rooms where true darkness is essential, a blackout roller shade, a blackout cellular shade, or a layered blackout drapery over the blinds delivers what venetian slats alone cannot.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">All Blindsgalore brand blinds and shades are custom-built to order and backed by a 3-year limited warranty upgradeable to five years. For a closer look at how long custom treatments last, the guide on \u200b<\/span><a href=\"https:\/\/www.blindsgalore.com\/blog\/index.php\/beyond-basics\/how-long-do-custom-blinds-last\/\"><span style=\"font-weight: 400;\">How Long Do Custom Blinds Last<\/span><\/a><span style=\"font-weight: 400;\"> covers lifespan across materials. \u200b<\/span><a href=\"https:\/\/www.blindsgalore.com\/free-samples\"><span style=\"font-weight: 400;\">Order free samples<\/span><\/a><span style=\"font-weight: 400;\"> and call the in-house experts at (877) 702-5463 to find the right blackout solution for each room.<\/span>[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column][vc_column_text][\/vc_column_text][vc_tta_accordion][vc_tta_section title=&#8221;Can venetian blinds block out light completely?&#8221; tab_id=&#8221;1748584617192-4098ffb8-e8c89b41-9873&#8243;][vc_column_text css=&#8221;&#8221;]<span style=\"font-weight: 400;\">No. Venetian blinds reduce light significantly but cannot block it completely due to gaps at the cord routes, between slats, and at the edges of the window frame. For true blackout, a roller shade, cellular shade, or blackout drapery is needed.<\/span>[\/vc_column_text][\/vc_tta_section][vc_tta_section title=&#8221;How do you block light with venetian blinds?&#8221; tab_id=&#8221;1786516369316-ba3ca1f3-400a&#8221;][vc_column_text css=&#8221;&#8221;]<span style=\"font-weight: 400;\">Choose routeless slats to eliminate cord holes, use an outside mount to cover edge gaps, and pick wider faux wood slats for better overlap. All three improvements reduce light but do not achieve full blackout.<\/span>[\/vc_column_text][\/vc_tta_section][vc_tta_section title=&#8221;Are there blackout venetian blinds?&#8221; tab_id=&#8221;1786516368726-1c7aaf3f-8bfa&#8221;][vc_column_text css=&#8221;&#8221;]<span style=\"font-weight: 400;\">No standard venetian blind achieves true blackout because of the inherent gaps in slatted construction. Routeless faux wood blinds come closest, but for complete darkness, a dedicated blackout shade or layered drapery is the better choice.<\/span>[\/vc_column_text][\/vc_tta_section][vc_tta_section title=&#8221;What are the best blinds for bedroom darkness?&#8221; tab_id=&#8221;1786516368263-cf1c69b8-0fca&#8221;][vc_column_text css=&#8221;&#8221;]<span style=\"font-weight: 400;\">Blackout roller shades and blackout cellular shades deliver the truest darkness for bedrooms. Cellular shades add insulation for temperature comfort, while roller shades offer the slimmest, cleanest profile.<\/span>[\/vc_column_text][\/vc_tta_section][vc_tta_section title=&#8221;Can you layer curtains over venetian blinds?&#8221; tab_id=&#8221;1786516367826-468aaade-b11f&#8221;][vc_column_text css=&#8221;&#8221;]<span style=\"font-weight: 400;\">Yes. Layering blackout drapery over venetian blinds gives you daytime light control from the blinds and full nighttime darkness from the drapes. The combination works well in bedrooms and media rooms.<\/span>[\/vc_column_text][\/vc_tta_section][vc_tta_section title=&#8221;What warranty comes with Blindsgalore blinds?&#8221; tab_id=&#8221;1786516367156-2652a2de-3e0d&#8221;][vc_column_text css=&#8221;&#8221;]<span style=\"font-weight: 400;\">Blindsgalore brand blinds carry a 3-year limited warranty with an upgrade to a 5-year warranty, covering defects in materials and workmanship when properly installed. Boutique products include a 5-year extended warranty. Fading is not covered.<\/span>[\/vc_column_text][\/vc_tta_section][\/vc_tta_accordion][vc_raw_js]JTNDc2NyaXB0JTIwdHlwZSUzRCUyMmFwcGxpY2F0aW9uJTJGbGQlMkJqc29uJTIyJTNFJTBEJTBBJTdCJTBEJTBBJTIwJTIwJTIyJTQwY29udGV4dCUyMiUzQSUyMCUyMmh0dHBzJTNBJTJGJTJGc2NoZW1hLm9yZyUyMiUyQyUwRCUwQSUyMCUyMCUyMiU0MHR5cGUlMjIlM0ElMjAlMjJGQVFQYWdlJTIyJTJDJTBEJTBBJTIwJTIwJTIybWFpbkVudGl0eSUyMiUzQSUyMCU1QiUwRCUwQSUyMCUyMCUyMCUyMCU3QiUwRCUwQSUyMCUyMCUyMCUyMCUyMCUyMCUyMiU0MHR5cGUlMjIlM0ElMjAlMjJRdWVzdGlvbiUyMiUyQyUwRCUwQSUyMCUyMCUyMCUyMCUyMCUyMCUyMm5hbWUlMjIlM0ElMjAlMjJDYW4lMjB2ZW5ldGlhbiUyMGJsaW5kcyUyMGJsb2NrJTIwb3V0JTIwbGlnaHQlMjBjb21wbGV0ZWx5JTNGJTIyJTJDJTBEJTBBJTIwJTIwJTIwJTIwJTIwJTIwJTIyYWNjZXB0ZWRBbnN3ZXIlMjIlM0ElMjAlN0IlMEQlMEElMjAlMjAlMjAlMjAlMjAlMjAlMjAlMjAlMjIlNDB0eXBlJTIyJTNBJTIwJTIyQW5zd2VyJTIyJTJDJTBEJTBBJTIwJTIwJTIwJTIwJTIwJTIwJTIwJTIwJTIydGV4dCUyMiUzQSUyMCUyMk5vLiUyMFZlbmV0aWFuJTIwYmxpbmRzJTIwcmVkdWNlJTIwbGlnaHQlMjBzaWduaWZpY2FudGx5JTIwYnV0JTIwY2Fubm90JTIwYmxvY2slMjBpdCUyMGNvbXBsZXRlbHklMjBkdWUlMjB0byUyMGdhcHMlMjBhdCUyMHRoZSUyMGNvcmQlMjByb3V0ZXMlMkMlMjBiZXR3ZWVuJTIwc2xhdHMlMkMlMjBhbmQlMjBhdCUyMHRoZSUyMGVkZ2VzJTIwb2YlMjB0aGUlMjB3aW5kb3clMjBmcmFtZS4lMjBGb3IlMjB0cnVlJTIwYmxhY2tvdXQlMkMlMjBhJTIwcm9sbGVyJTIwc2hhZGUlMkMlMjBjZWxsdWxhciUyMHNoYWRlJTJDJTIwb3IlMjBibGFja291dCUyMGRyYXBlcnklMjBpcyUyMG5lZWRlZC4lMjIlMEQlMEElMjAlMjAlMjAlMjAlMjAlMjAlN0QlMEQlMEElMjAlMjAlMjAlMjAlN0QlMkMlMEQlMEElMjAlMjAlMjAlMjAlN0IlMEQlMEElMjAlMjAlMjAlMjAlMjAlMjAlMjIlNDB0eXBlJTIyJTNBJTIwJTIyUXVlc3Rpb24lMjIlMkMlMEQlMEElMjAlMjAlMjAlMjAlMjAlMjAlMjJuYW1lJTIyJTNBJTIwJTIySG93JTIwZG8lMjB5b3UlMjBibG9jayUyMGxpZ2h0JTIwd2l0aCUyMHZlbmV0aWFuJTIwYmxpbmRzJTNGJTIyJTJDJTBEJTBBJTIwJTIwJTIwJTIwJTIwJTIwJTIyYWNjZXB0ZWRBbnN3ZXIlMjIlM0ElMjAlN0IlMEQlMEElMjAlMjAlMjAlMjAlMjAlMjAlMjAlMjAlMjIlNDB0eXBlJTIyJTNBJTIwJTIyQW5zd2VyJTIyJTJDJTBEJTBBJTIwJTIwJTIwJTIwJTIwJTIwJTIwJTIwJTIydGV4dCUyMiUzQSUyMCUyMkNob29zZSUyMHJvdXRlbGVzcyUyMHNsYXRzJTIwdG8lMjBlbGltaW5hdGUlMjBjb3JkJTIwaG9sZXMlMkMlMjB1c2UlMjBhbiUyMG91dHNpZGUlMjBtb3VudCUyMHRvJTIwY292ZXIlMjBlZGdlJTIwZ2FwcyUyQyUyMGFuZCUyMHBpY2slMjB3aWRlciUyMGZhdXglMjB3b29kJTIwc2xhdHMlMjBmb3IlMjBiZXR0ZXIlMjBvdmVybGFwLiUyMEFsbCUyMHRocmVlJTIwaW1wcm92ZW1lbnRzJTIwcmVkdWNlJTIwbGlnaHQlMjBidXQlMjBkbyUyMG5vdCUyMGFjaGlldmUlMjBmdWxsJTIwYmxhY2tvdXQuJTIyJTBEJTBBJTIwJTIwJTIwJTIwJTIwJTIwJTdEJTBEJTBBJTIwJTIwJTIwJTIwJTdEJTJDJTBEJTBBJTIwJTIwJTIwJTIwJTdCJTBEJTBBJTIwJTIwJTIwJTIwJTIwJTIwJTIyJTQwdHlwZSUyMiUzQSUyMCUyMlF1ZXN0aW9uJTIyJTJDJTBEJTBBJTIwJTIwJTIwJTIwJTIwJTIwJTIybmFtZSUyMiUzQSUyMCUyMkFyZSUyMHRoZXJlJTIwYmxhY2tvdXQlMjB2ZW5ldGlhbiUyMGJsaW5kcyUzRiUyMiUyQyUwRCUwQSUyMCUyMCUyMCUyMCUyMCUyMCUyMmFjY2VwdGVkQW5zd2VyJTIyJTNBJTIwJTdCJTBEJTBBJTIwJTIwJTIwJTIwJTIwJTIwJTIwJTIwJTIyJTQwdHlwZSUyMiUzQSUyMCUyMkFuc3dlciUyMiUyQyUwRCUwQSUyMCUyMCUyMCUyMCUyMCUyMCUyMCUyMCUyMnRleHQlMjIlM0ElMjAlMjJObyUyMHN0YW5kYXJkJTIwdmVuZXRpYW4lMjBibGluZCUyMGFjaGlldmVzJTIwdHJ1ZSUyMGJsYWNrb3V0JTIwYmVjYXVzZSUyMG9mJTIwdGhlJTIwaW5oZXJlbnQlMjBnYXBzJTIwaW4lMjBzbGF0dGVkJTIwY29uc3RydWN0aW9uLiUyMFJvdXRlbGVzcyUyMGZhdXglMjB3b29kJTIwYmxpbmRzJTIwY29tZSUyMGNsb3Nlc3QlMkMlMjBidXQlMjBmb3IlMjBjb21wbGV0ZSUyMGRhcmtuZXNzJTJDJTIwYSUyMGRlZGljYXRlZCUyMGJsYWNrb3V0JTIwc2hhZGUlMjBvciUyMGxheWVyZWQlMjBkcmFwZXJ5JTIwaXMlMjB0aGUlMjBiZXR0ZXIlMjBjaG9pY2UuJTIyJTBEJTBBJTIwJTIwJTIwJTIwJTIwJTIwJTdEJTBEJTBBJTIwJTIwJTIwJTIwJTdEJTJDJTBEJTBBJTIwJTIwJTIwJTIwJTdCJTBEJTBBJTIwJTIwJTIwJTIwJTIwJTIwJTIyJTQwdHlwZSUyMiUzQSUyMCUyMlF1ZXN0aW9uJTIyJTJDJTBEJTBBJTIwJTIwJTIwJTIwJTIwJTIwJTIybmFtZSUyMiUzQSUyMCUyMldoYXQlMjBhcmUlMjB0aGUlMjBiZXN0JTIwYmxpbmRzJTIwZm9yJTIwYmVkcm9vbSUyMGRhcmtuZXNzJTNGJTIyJTJDJTBEJTBBJTIwJTIwJTIwJTIwJTIwJTIwJTIyYWNjZXB0ZWRBbnN3ZXIlMjIlM0ElMjAlN0IlMEQlMEElMjAlMjAlMjAlMjAlMjAlMjAlMjAlMjAlMjIlNDB0eXBlJTIyJTNBJTIwJTIyQW5zd2VyJTIyJTJDJTBEJTBBJTIwJTIwJTIwJTIwJTIwJTIwJTIwJTIwJTIydGV4dCUyMiUzQSUyMCUyMkJsYWNrb3V0JTIwcm9sbGVyJTIwc2hhZGVzJTIwYW5kJTIwYmxhY2tvdXQlMjBjZWxsdWxhciUyMHNoYWRlcyUyMGRlbGl2ZXIlMjB0aGUlMjB0cnVlc3QlMjBkYXJrbmVzcyUyMGZvciUyMGJlZHJvb21zLiUyMENlbGx1bGFyJTIwc2hhZGVzJTIwYWRkJTIwaW5zdWxhdGlvbiUyMGZvciUyMHRlbXBlcmF0dXJlJTIwY29tZm9ydCUyQyUyMHdoaWxlJTIwcm9sbGVyJTIwc2hhZGVzJTIwb2ZmZXIlMjB0aGUlMjBzbGltbWVzdCUyQyUyMGNsZWFuZXN0JTIwcHJvZmlsZS4lMjIlMEQlMEElMjAlMjAlMjAlMjAlMjAlMjAlN0QlMEQlMEElMjAlMjAlMjAlMjAlN0QlMkMlMEQlMEElMjAlMjAlMjAlMjAlN0IlMEQlMEElMjAlMjAlMjAlMjAlMjAlMjAlMjIlNDB0eXBlJTIyJTNBJTIwJTIyUXVlc3Rpb24lMjIlMkMlMEQlMEElMjAlMjAlMjAlMjAlMjAlMjAlMjJuYW1lJTIyJTNBJTIwJTIyQ2FuJTIweW91JTIwbGF5ZXIlMjBjdXJ0YWlucyUyMG92ZXIlMjB2ZW5ldGlhbiUyMGJsaW5kcyUzRiUyMiUyQyUwRCUwQSUyMCUyMCUyMCUyMCUyMCUyMCUyMmFjY2VwdGVkQW5zd2VyJTIyJTNBJTIwJTdCJTBEJTBBJTIwJTIwJTIwJTIwJTIwJTIwJTIwJTIwJTIyJTQwdHlwZSUyMiUzQSUyMCUyMkFuc3dlciUyMiUyQyUwRCUwQSUyMCUyMCUyMCUyMCUyMCUyMCUyMCUyMCUyMnRleHQlMjIlM0ElMjAlMjJZZXMuJTIwTGF5ZXJpbmclMjBibGFja291dCUyMGRyYXBlcnklMjBvdmVyJTIwdmVuZXRpYW4lMjBibGluZHMlMjBnaXZlcyUyMHlvdSUyMGRheXRpbWUlMjBsaWdodCUyMGNvbnRyb2wlMjBmcm9tJTIwdGhlJTIwYmxpbmRzJTIwYW5kJTIwZnVsbCUyMG5pZ2h0dGltZSUyMGRhcmtuZXNzJTIwZnJvbSUyMHRoZSUyMGRyYXBlcy4lMjBUaGUlMjBjb21iaW5hdGlvbiUyMHdvcmtzJTIwd2VsbCUyMGluJTIwYmVkcm9vbXMlMjBhbmQlMjBtZWRpYSUyMHJvb21zLiUyMiUwRCUwQSUyMCUyMCUyMCUyMCUyMCUyMCU3RCUwRCUwQSUyMCUyM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css=&#8221;&#8221;]Venetian blinds cannot block out light completely. Even when fully closed, the horizontal slats leave small gaps at the cord routes, along the edges of the window, and between the slats themselves where light slips through.\u00a0 Venetian blinds are excellent at controlling light, reducing glare, and providing privacy, but they are not a blackout&hellip;<\/p>\n","protected":false},"author":14,"featured_media":28811,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[845],"tags":[],"thb-sponsors":[],"class_list":["post-28781","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-beyond-basics"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Do Venetian Blinds Block Light Completely?<\/title>\n<meta name=\"description\" content=\"Can venetian blinds block out light fully? The honest answer is no. 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