In science, what is the name given to a substance with characteristic reactions used as a chemical test?
Chemical test in mushroom identification a bright orange color forms where the lines cross. "Agaricus placomyces" and "Agaricus xanthodermus" produce false negative reactions. Sometimes referred to as "Schaeffer's reaction", "Schaeffer's cross reaction" or "Schaeffer's test". Made from sulfuric acid (HSO) and vanillin (vanilla). Used in "Russula" and "Panaeolus" identification. Chemical test in mushroom identification Chemical tests in mushroom identification are methods that aid in determining the variety of some fungi. The most useful tests are Melzer's reagent and potassium hydroxide. Household ammonia can be used. A couple of drops are placed on the flesh. For example, "Boletus spadiceus" gives a fleeting blue to blue-green reaction.
Chemical substance Chemical substance A chemical substance is a form of matter having constant chemical composition and characteristic properties. It cannot be separated into components by physical separation methods, i.e., without breaking chemical bonds. Chemical substances can be simple substances, chemical compounds, or alloys. Chemical elements may or may not be included in the definition, depending on expert viewpoint. Chemical substances are often called 'pure' to set them apart from mixtures. A common example of a chemical substance is pure water; it has the same properties and the same ratio of hydrogen to oxygen whether it is isolated from a river or