Hi ive been printing on mugs for a while now and have now gone on to tshirts having managed to get an Adkins press. Ive got some Russell tshirts supposedly ideal for sublimation. My first tshirt is black and I set the press for 60 seconds at 190. When it was finished though there was absolutely nothing of the image on the tshirt Is this because its black and do you have to prime the garment with a solution when sublimating on black or does this apply to all colours has I also have blue and green tshirts. Thanks