I heard Pink and Pinks (even if they were yellow) got there name from their "pinked" edges-- so Fibrebabe was on the right track--

Pinks had pinked edges-- a kind of zig zag or saw toothed edge.. and gave there name to the color. Pinking shears are named because they too, create a pinked edge-- This was a word i remember looking up as a child-- i wondered why "Pinking shears" where pinking shears.. what was pinking? I wasn't sure if Pink the color and pinking were releated-- and didn't know pinks as flower at all! (but now it have them in my garden! -- easy to grow short lived perennial!)