according to
www.seaandreef.com, both the frostbite and wyoming's fins will turn black as they age. The flurry supposedly won't, for what it's worth.
from their website on Wyoming White:
" Their fins are dark shortly after metamorphosis and turn jet black as the fish grows."
from their website on Frostbite:
"The phenotype resembles mostly the Wyoming White with the uniform white coloration and fins that turn black with age. However, they have black irregular markings in the form of spots and blotches"
from their website on Flurry:
"They are similar to our Frostbite Clownfish, but our flurry Clownfish are either pure white or have only a few black spots. They have more orange coloration in the fins compared to Wyoming Whites that will develop all black fins."
The photos they have on their site are mostly juveniles.
Or just call it george...