While it doesn't promise to stain the lips; it does wear off and since I'm horrible about drinking enough water, after a few hours it did go a bit patchy on my lips and clung to the dry patches that had developed. Moisturized lips are a must and so is some amount of reapplication, especially if you are eating or drinking; however this was 6 hours after application with some drinking (not water like I should have been, but an iced coffee). Still, a little lip balm and a tissue to wipe off the excess and my lips handled another application and looked just like I first applied it.
The pencil features a built in sharpener in the lid and I really like how the color is at the end of the stick so I can find in my stash or handbag easily.
From left to right is 1 swipe, 2 swipes, and kind of a "fill in" like you might do with a lip pencil. As you can tell, it's glossy and pigmented, though the color isn't exactly coming across well. One other major reason I like this pencil is it doesn't smell strongly of mint which seems to be a trend with these lip crayons and I don't hate mint, but I don't love it.
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* Butter London provided products for review. I always provide my honest opinion of a product.