TY JOUR TI STUDYING THE POSSIBILITY OF OBTAINING NATURAL DYE FROM SECONDARY PRODUCTS OF GRAPES AND FOREST BERRIES PROCESSING KW coloring agents KW extraction KW heat treatment KW grape pomace KW lingonberry and blueberry pulp KW enzyme preparations JO Bulletin of KSAU AU Chernobrovina, A.G. AU Kulikova, N.E. AU Roeva, N.N. PY 2025 IS 0 PB Krasnoyarsk State Agrarian University