So back a couple years ago, last time we bought pond fish, a tiny bonus fish got into the bag. We hadn't seen him in a long time.
Then just this year, we started noticing him again. He was solid black, so he was hard to see.
When he got about 4 inches long, he started slowly turning orange- like the black was rubbing off of him showing orange underneath. But not orange like the red&white sarassa, goldfish orange, more like the shubunkin. We do have one that's all orange and black, with no bluegray or white on him.
So for a while he was mostly orange with scattered black. Then overnight, his whole body turned ghost white. his head has a calico orange pattern on it still, but the entire rest of him is translucent/iridescent white. (again, not like the chalkwhite of the sarassa)
TL;DR seth haz a fishy