sentences:  These nuclei are then dipped into a special pearly liquid, hemage, an adhesive paste made of oil and ground up fish scales or mother-of-pearl for their iridescence.The coated nuclei are then dried and polished by hand to remove imperfections such as bumps and blemishes.This coating process is repeated (around 30 times) until a multitude of fine layers is formed over the nuclei, building up the density and color uniformity.