hi
yes you can dye with wiltons.. i started with wiltons and food coloring
washing and sunlight will cause fading overtime
i'm pretty sure that these socks were dyed with wiltons
the yarn is KP superwash.. they have faded with machine washing..but even more so on the bottom from wear
nylon does dye with acid dyes..and takes dye quite well.. but i've only used jacquard dye for nylon..so i'm not sure how it will take to food coloring