So far the colorless blender is great so it's useless to me but I'm still new to using it and will report later. It wasn't difficult to undo both ends but as others have said it's a pretty tight fit but not too bad. Update: I used this marker for Prisma watercolors and it blends well. Not great for what I used it for, but I used it for the interior blue of a hummingbird. Will continue to test and update soon.
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