Dark T–shirts are not necessarily more difficult to paint, but the paint colors must. you can choose between fabric or acrylic paints to create permanent designs.
Freehand Acrylic Painting for T–shirts: I saw lots of instructables for using stencils on shirts. Those are great, but some of us have short attention spans and prefer .
I need to paint flames on black fabric and want them to really be bright.. definitely fabric paint. sometimes acrylic paints turn out weird when you wash. As long as it's marketed as opaque and meant for dark t–shirts, it'll be perfect for your use.
Painting designs on red or dark colored shirts can often require a base coat. I am applying acrylic paint on a red t–shirt and the red is bleeding thru the acrylic.
There are many ways of painting t–shirts, from free-handing to using stencils to spray. .. If you're using acrylic paint, water it down a lot, or mix it with textile paint.