Singe can effect otter if you put too much heat on it or flesh it when putting it up dry... Wet fleshing beam and otter pelt before fleshing.. Otter hair singe naturally just fm sliding along on ice and snow after they go down in primeness. You can tell if otter are singed just by the dull look of fur with light shining on pelt. If your not sure hold pelt up to light and look at guard hairs standing up. If hair is straight it is okay but if each guard hair has a curl to it at very end its singed... If you have the right color (pale) singe doesnt make a differance in price but if you have a dark otter and its singed they drop price drastically. Also dont put otter on metal after caught in the cold, always put inside of a bag to protect fur.