We bought these colors for the 7th birthday of our daughter. These pins T-Shirts were painted. The pins are indeed the colors of her very pretty strong, but not so well when using because they lubricate very. You always have to instruct the children, that they may not live in the colors of their hands, because they are usually on the hands and it leaves wüschte footprints on the T-shirts. I think that's a disadvantage. If the children are old enough to be able to make sure you can take this color. However, yes it is that one should leave the matter either dry 24, or to iron, but drying is not the exactly the rage, at least our shirts have given the color something.