Histotechnology

thumb|Histologic specimen being placed on the stage of an optical microscope right|300px|thumb|Human lung tissue stained with [[hematoxylin and eosin as seen under a microscope]]

Limonene () is a colorless liquid aliphatic hydrocarbon classified as a cyclic monoterpene, and is the major component in the fragrance and essential oil of citrus fruit peels, taking its name from Italian limone ("lemon").

histological stain method using hematoxylin and eosin

microbiological method for identification

stain used for diagnosis of malaria

chemical compound

thumb|White wool yarn dyed with "orchella weeds", using traditional Natural dye|plant dye methods. Orcein, also called archil, orchil, lacmus and C.I. Natural Red 28 - CICN 758600, is any dye extracted from several species of lichen, commonly known as "orchella weeds", found in various parts of the world. A major source is the archil lichen, Roccella tinctoria. Orcinol is extracted from such lichens. It is then converted to orcein by ammonia and air. In traditional dye-making methods, urine was used as the ammonia source. If the conversion is carried out in the presence of potassium carbonate,

histochemical method to detect DNA

chemical compound

chemical compound