To emboss using a heat gun, stamp your image onto a piece of paper and cover generously with embossing powder. Turn the heat gun on and wait for it to get to its full heating power. With the heat source a couple of inches from the surface of the paper, apply even heat to the image. After a few seconds, you’ll see it start to puff up and the colour will change. When the whole image is puffy and a consistent, dry the colour and you’re done.