these are great for light coloured material, i did a picture on a pale pink T shirt
and one on a beige hessian shopping bag, when i tried on a navy tshirt it failed and could not be seen.
Instructions say not to use an ironing board but it came out ok when i did it.
One tip is... when using an image with words, don't forget the writing will come out mirror image
i just changed that in my printer options ( advanced i think), so when it printed the words were back to front, which is how you want it to be before you iron it onto fabric.