RIT does have dye for synthetics. I had to dye some beige nylon Northface trousers that I soaked overnight in bleach, because I had previously spilled bleach on parts of them. After that they then looked like yellow golf pants. That's not my kind of fashion statement. Then I asked around and discovered this dye for synthetics. They are now brown all over. I got it at JoAnn's or Walmart.
https://www.ritdye.com/type/dyemore-for-synthetics/
As for other strap coloring, a few years ago, on one set of my kevlar straps, the shorties, I used a large jumbo black sharpie. Worked fine. But I also wanted some long camo kevlar straps. I bought four colors of flat camo rattle can paint. They're out in my storage shed so I don't want to go look and shovel out snow --, but some are Krylon brand and I think one or two are Rustoleum. All are flat camo. Easy to find. Made the straps stiff but so what, they no longer look like straight lines from a distance, as black ones or beige ones do. Hope this helps.
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