Scratches will not harm the mold for use with sugar multiple times. Powdered Food coloring to tint sugar Place the sugar in a large bowl. Color as desired. The amount of sugar mixture will vary with the size of the mold of course. Pack this mixture into the mold and immediately invert it onto a square piece of card board not too much larger than your mold.
Place molds on a cookie sheet.
You must experiment a little. All ovens are a bit different too, so yours may require a minute or two more or less than my oven. Hold the baked sugar piece in your hand and carefully, use a spoon to scoop out all the loose sugar. Invert so the inside can dry. Dry pieces overnight.