Paint your card with acrylic paint and let dry. This is the color that will be revealed through the resist.
Stamp an image over the paint with clear embossing ink, sprinkle on clear embossing powder and heat set.
Lightly paint over the entire surface with a contrasting color of acrylic paint and let dry.
Place your card on a heat resistant surface, then place a piece of scrap paper over your card and use a hot iron over the paper. Use lots of pressure and move the paper around quickly so it doesn't stick to the card. Save the scrap that picks up the top layer of acrylic paint and the embossing ink.