This is a cotton T from H You need to soak it and rinse out the water. Make the dye bath according to the bottle. I find liquid dye much easier to work with. Dip it in the dye a few times and rinse. Remember to rince downwords, so that the whole T does not become blue. Dry. If you think the color is to light, simple repeat the whole process.
31 Clothing Tips & Tricks Every Girl Should Know (With Pictures)