Here are the results of my dye project I did earlier today. My wife is an RN and wore the heck out of her Baby G. She stopped wearing it as it was getting yellowed.
I broke down the watch into it's components
Next I put brought 6 cups of water to a boil and dumped in a whole packet of RIT dye and boiled the plastics for about 10 minutes, and then rinsed them off and put them on a towel
Then into the hot 1 part vinegar / 1 part water mixture for another 10 minutes
The dyed components drying...
And the completed watch