advice needed please

[puds]

[INDENT]hi all need to do some colour changing mugs i did one but you can still see the pic when cup goes back to black i have got to be doing somthing wrong hope you can help
im useing a [h=DF1+ Genius Mug Press got a 3d press if thats better]2[/h] [/INDENT]

[Paul]

black coating is not as black as we all wish.... so if picture alway is visible a little.