Yes the Tide To Go Pen stain remover does work on colors.
Tide To Go Stain Remover pen is meant to take out stains that happen right then and the longer you let the stain sit in the clothes the less likely it will be that the tide to go pen will work.
As long as you use the tide to go pen as soon as you stain the clothes the tide to go pen will remove the stain.
I've had good luck using the tide to go pen to remove stains that happened right then and carry a couple with me.
I've used tide to go pens to remove stains on my babies clothes and toddlers clothes when out eating in public or at picnics and they have been a great thing to have.
Kids and babies and toddlers especially are messy eaters and they can easily leave stains on their clothes.
So having a tide to go pen is handy to remove those stains.
I even stain my own clothes sometimes and sometimes I think I should be wearing a bib myself especially when eating messy foods such as spaghetti or foods with sauce.