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After well over a week of soaking , I have my report on RIT dye: Absolute failure. From left to right: cloth soaked in dye for 10 seconds, FAG upper arm (heavily sanded) , FAG leg part, White koto runner chunk, grey FAG part, White Gunpla part, Spess marine shoulderpad, ancient yellow resin (washed and scrubbed), fresh white resin (washed)
It looks like they've successfully got their new formula to only stick to cloth, which is bad news for anyone hoping to dye model parts.