I can attest to that. I think 05 is the worst when it comes to quickly darkening handles. I've had my #1 fave Bal

for six months now and I'm always super careful with her. I've used the bag maybe 20 times, tops. No hand lotion, sanitizer and what have you.
The top of the handle is just fine.
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The underside not so much...ewww... LOL!
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And in all her Rouge Theatre glory, just because.
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I love this bag to pieces, but I wish there was a way to prevent this. Tried a twilly, but it looks ridiculous...