Определение bead test в Английский Язык Английский Язык словарь
A test to identify the metal constituents of a mineral in which a bead covered with the mineral is heated in a flame and cooled to observe its characteristic color and other properties
in qualitative inorganic analysis, a test for the presence of certain metallic elements by observing the colours given to a bead of borax in a loop of platinum wire held in the oxidizing and reducing parts of a Bunsen burner flame