Imitative methods to the fill the losses of the enamel decoration – retouching of colour

Abstract

To the colour unification, at the reconstruction of decorative layer, various types of coloured film-forming products are used. They should be characterizing by excellent colour stability and good adhesion to the substrate. Colour stability of the coating depends on the chemical nature of the binder, of pigment or organic dye. Pigments or dyes must be soluble or should be compatible with the binder. Dimensions of the filler particles must be smaller than the wavelength of visible radiation (380–780 nm), so they don’t be scatter the light. In that case, even in small amounts, may give coloured coating with partial transparency. Pigments also may act as shielding materials for the deeper layer of macromolecular coating. This is a result of UV absorption only in the near-surface layer of the coating and barrier effect. Commercial, decorative paints, useful at conservation and restoration, based on natural resin e.g. mastic or on synthetic resins – acrylic, alkyd, ketone. This work shows the selected results obtained from laboratory tests of film-forming products made on the basis of various macromolecular binders.