Histological dyes based on extracts of grape berries and black currant

New histological nuclear dyes were obtained from grape berries and black currant. They can be used as analogues of hematoxylin, crezyl violet and thionine. Their advantages include color, intensity, stability and selectivity of the staining, as well as the easy availability of raw materials, usage of nontoxic ingredients and simplicity of preparation of the coloring solution. As a result of the experiments general recommendations were developed to obtain high quality basic dyes based on vegetable raw materials with a high content of anthocyanins.