Thomas Modification ideas: assistance needed

You can change the plastics color with RiT dye! It's a tricky process, but it works. The water must be boiling, but I f the water is too hot you'll run the risk of warping...too cold and it won't absorb into the plastic. Shells are harder to do because they are thinner and are a slightly different plastic composition, but wheels are very easy and can withstand more heat and accept the dye very well.

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This was a blue Thomas shell, and Thomas' wheels on Stepney.