Well at least you can rule out standard sublimation.
You can use systems such as the OK I white etc. which lay down a white toner underbase, but is quite expensive, or you can try special papers such as Jet-Opaque, but I've never achieved good washable results with these.
For dark shirts, without laying out a fortune in equipment, I'd stick to htv or plastisol transfers.
You can use systems such as the OK I white etc. which lay down a white toner underbase, but is quite expensive, or you can try special papers such as Jet-Opaque, but I've never achieved good washable results with these.
For dark shirts, without laying out a fortune in equipment, I'd stick to htv or plastisol transfers.