Hello. I am attempting to make milk jewlery in resin. I have made a few pieces by just mixing milk with resin. It does yellow some over time though. Is anyone aware of a chemical I could add to the milk to preserve it, without it yellowing over time? I know there is as all the breast milk artists out there use some sort of chemical but they don't talk about what it is. Would formaldehyde work? If so, how would it react to an epoxy resin? I appreciate any insight you can give! Thank you.