Apply marble poultice to the stain. The poultice typically consists of a small percentage of hydrogen peroxide mixed with white napkins or paper towels, creating a moist medium.
Cover the poultice with plastic wrap. Allow the poultice to draw out the stain for 48 hours.
Remove the plastic wrap, towel and poultice. Inspect the stained area. Depending on the extent of the scorch, some of the stain may still be visible. If it is still visible, try an alternative scorch stain removal method below.
Apply a 50/50 mixture of water and ammonia to the stain as an alternative to the poultice.
Allow the mixture to soak into the marble for five minutes. Scrub the stain with a soft brush. The stain should slowly lighten.
Repeat the process if the stain lightens with each application. The progressive lightening will eventually become invisible to the human eye.