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Most of that cutting looks good but the bottom may be gone. It didn't root because your "soil" doesn't have enough air in it. After 4 weeks if a cutting doesn't root I throw out the medium and start over. Get fresh perlite, as coarse as you can find. Rinse or sift out the fine particles. Use 90-95% perlite and the rest peat or whatever potting soil you have. You should have lots of visible air spaces and water should run out rapidly. If the bottom of the cutting looks soft cut it away until you get green cambium, sterilizing the pruners after each cut. I score the bark at the lower part of the cutting and use clonex on mine but many don't. Just in case that's glass in your photo, there should be drainage holes in the bottom of your rooting container. It's best to have the bottom of the cutting at least an inch or 2 above the bottom of your container so perched water isn't an issue.
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