AI've been using Wilton candy color to color almond bark pink and it keeps fading back to white within 24hrs. How can I fix or prevent this?

wow! I do this all the time and have never experienced a fading issue. in fact, the wilton candy pink has a tremendous punch...a little goes a very long way. I recently colored a batch using one toothpick dip to color an entire 24 oz block of almond bark.

could you have gotten a bad batch of coloring?  

ANo, I don't think so. It only faded with the pink. I colored blue, yellow, orange, purple and green as well, without issue. But the pink keeps fading. I asked on another site and various users told me to keep it out of sunlight

well, I suppose long term direct sunlight could cause fading...but I've never tested it. I use almond bark to dip cake pops and have always kept them out of sunlight simply for fear of melting. the pops have been exposed to open air and indirect sunlight for days without any noticeable fade...I'm staring at a pink batch right now that are the same color as the day I dipped them.  

AI'll try making a new batch. Thanks!