Paint or Ink Pads

I purchased a 20 color set of ink pads by BESS, for my grandson, so he could finger paint. At the same time, I was designing my Rokuhan Shorty shells. Thinking ahead, I decided to add raised details to my shells. I've been experimenting with this car. I've learned that you can wash the ink off, even after it dries 24 hours. It's more like chalk in water...than ink. This car was printed in orange nylon. The roof is brown ink/chalk and the trim is green ink/chalk.