I used to teach scuba with another dive instructor who did that to his fins. He did it so that students could keep an "eye" on him better- and so no one else would walk off with his fins on the dive boat since they all looked the same (black rubber) back then.
He wasn't into spearfishing s I don't know how it worked for him around fish.
Jon
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Imagination is intelligence with an erection. - Victor Hugo
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