It is traditional to sprinkle the top with finely grated nutmeg before baking. Traditional recipes include very finely ground nuts, usually almonds. Optically variable ink uses finely powdered iridescent glitter. Rice flour (also rice powder) is a form of flour made from finely milled rice. It was tightly covered in finely polished, white limestone. Egyptian stelas are decorated with finely carved hieroglyphs. All reliefs were made of finely polished limestone. Dust clouds of finely powdered substances can become combustible or explosive. This is especially dangerous with finely powdered thermite. Each finely and sharply serrate leaf is long. Many researchers have instead used more finely grained scales. This technique involves pleating sections of the cloth very finely and evenly. Many sophisticated and finely carved seals survive. Sand is a granular material composed of finely divided rock and mineral particles. The lead of the pencil is a mix of finely ground graphite and clay powders.