I’m trying to make some patterns or cool designs with this
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I love a good experiment, keep us posted!
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Thanks I’ll try my best I’m worried if someone in my house is going to throw it away but should be fine
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You could write “not trash” on the cardboard haha.
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Not trash… art ! 
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Update: the strings have not changed colour at all
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The string you originally said turned purple was also pretty worn. It may have been a combination of being dirty from your hand oils and sun exposure. Also, glass absorbs UV light, so you will get higher UV outside in the sun than inside. Overall dyes can be altered by sunlight, even the white strings likely have been bleached. Plus artificial light can vary a lot in tone making colours and white tones vary.
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Is the wizard purple?
So what you are saying is… for the sake of experiment next step is rub the strings all over your face and hair to capture as many oils as possible.
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Make sure to wash old string too make sure it’s not just dirty
no it is blue
I need to do this… For science !
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Guessing that the color in the string came from the yoyo and that’s also why the finger loop isn’t purple. I’ve had string discolor a yoyo and vice versa. NBD imho. 
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Definitely had that with stained/painted yo-yos. Never with an ano though
There are a few threads here where people mention ano coming off on grinds. Some suggested that it was more often with 7 series AL, but I think there are examples of both. I’ve got one or two that I noticed some color rubbing off anodized AL. It’s not common, but it happens.
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U know the string may have had a yellow cast/dye to make it look yellow white vs blueish white so when the sun bleached it it went back to the blueish color….sometimes companies have tones they add to make things look whiter. Like a brand T-shirt which looks super neon white then after you wash it it fills out…..usually this happens th other way though…not turning purple but turning yellow
Edit, could be string absorbing the lube from the bearing or the bearing rubbing against the string might be doing it as well as previously stated oil from hands
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“Hello, may I talk to Mr.Kitty? We have questions…”
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When making certain off whites they use a toner and the toner must of not fully activated during production