TY JOUR TI On the synthesis and properties of black magnetic iron oxide pigments KW magnetic pigment KW magnetic permeability KW properties KW colour coordinates KW hardness JO From Chemistry Towards Technology Step-By-Step AU Anufrieva, G.B. AU Komina, A.A. AU Tereshko, A.E. PY 2025 IS 6 PB Yaroslavl State Technical University