Step 1
Wash the t-shirt with laundry detergent in the washing machine or by hand, but do not dry. Remove any stains with color remover following the directions on the package.
Step 2
Test the fabric first to make sure the shirt can be dyed successfully. Cut a small piece of fabric from the seam, pocket, or hem of the t-shirt. Dye the fabric swatch and examine it before you proceed to dye the shirt.
Step 3
Dye the t-shirt by hand. Dissolve the fabric dye in just enough hot water to cover the shirt. Add the wet t-shirt to the dye and water solution. Let the t-shirt sit in the dye bath for 20 to 30 minutes. Check the shade of the shirt. If it is not dark enough, add more dye to the hot water, put the t-shirt back in and let it sit another 20 to 30 minutes. Keep the water hot during the whole process. Rinse in cold water until no dye is left in the water. Squeeze the shirt out gently, then hang it up to dry.
Step 4
Dye the t-shirt using the washing machine method. Fill the washing machine with just enough hot water to cover the shirt. Dissolve the fabric dye in one liter of hot water. Add the solution to the washing machine. Place the wet t-shirt into the dye bath. Make sure the shirt is completely covered.
Step 5
Run the shirt through the normal wash cycle. Run the cycle again for darker colors. Set the normal rinse cycle using cold water. Put the shirt through the spin cycle.