Projection and communication board, characterised in that it consists of a double-sided enamelled steel plate with an enamel undercoat, on which a second white enamel coat is laid on the writing side, which after annealing presents a roughness of: Ra = 0.6-1.2 μm Rz =3.0-8.0 μm R3z = 3.0-8.0 μm and on which a third thin finishing coat is applied consisting of enamel powder, more than 90% of which consists of grains of less than 15 μm, and which after annealing presents a roughness of: Ra =0.4-1.4 μm Rz =2.0-6.0 μm R3z =2.0-6.0 μm