lab color preservative

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User196221

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What is the best preservative for lab colors? Been keeping them in refrigerator and one of the blues went gray color. Bummers!
 
Where did you buy the lab colors? I think all of Brambleberry's have preservative already included. New Directions' doesn't have preservative but you could use phenoxyethanol like BB's.

How long have you had them in the frig? I'm surprised the blue turned gray but maybe it's to be expected with blue. I don't know since I've never used lab colors.
 

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