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i can get close to screen printing quality on dark shirts using opaque tranfers or plastisol. | |  | |  | |
Yes you can with plastisol transfers (since it is basically screen printing, just on transfer release paper).
Plastisol transfers aren't printed from your computer though, they have to be outsourced to a screen printer that specializes in plastisol transfers.
Custom Plastisol Transfer printers:
Where do you buy YOUR custom plastisol transfers? - a list of vendors!