Back in 89 or 90, I used a black Marks-a-lot on a spare Astro-Viper right arm
to create a replacement arm for my Snake-Eyes v1.0
. What happened 15-20 years later is that long after this arm went in the spare parts bin, it looks more like a red Astro-Viper arm dyed black. Crevaces are still black, but most of it is a (formerly) bright red dulled by a (nearly) worn off black magic marker.
Eventually, I may attempt to clean the crevices and restore it to being a bright red arm with thinning silver detailing.