Discoloration

I've had that happen and I hate it.  It seems, fir me, it only happens when I use the oven or dehydrator.  If I just let them dry naturally I rarely have that trouble.

Is it only with red and blue? All of my red cookies went blotchy I had some issues with white as well, but not wit any other colour!

i'll take a stab at it    more comments are welcomed too    i have never had this problem        i don't have a dehydrator   never put in oven to dry         i use a cookie grid to air dry              was your butter too hot    did you chill cookie cut outs before baking      were they too air temp when you baked       did you use a higher fat content butter   (is that how its said?)        did you over beat your butter/sugar       

after baking put on an open cookie grid      use a fan to dry   both sides       i have seen my cookies look 'wet' on the bottom    flipped them over and  for about 15 minutes   air dry time        then  put the fan on them                

The last time I had discoloration it was with ivory (with a touch of brown in it).  It was a test cookie.  The next time I made it, no dehydrator or oven and no discoloration.  Last summer I had it happen on some starfish colored ivory that became discoloed.  Outside it was muggy and there was smoke in the air.   Luckily, because it was starfish everyone thought I did it on purpose.

Ever since I started coloring my icing white, during the making of it, I haven't had any discoloration issues.  I also dry my cookies with a fan or heater, depending on the weather.