Known as emboss resist technique, what that means is you stamp the image with Versamark clear ink pad sprinkle with white embossing powder and tipping off the excess powder back into the pot and heating with the heat gun.
Allow embossed image to cool and set (just a few seconds) .
Using a sponge dauber apply the ink to the centre of the snowflakes in a gentle, circular motion working to the outer edges of the snowflake allowing the ink to fade away.