O sistema das nove cores na reintegração cromática de bens culturais

The selection of the most suitable colours for retouching practice is usually not an easy matter to settle. In order to use a restricted palette, many conservators choose to use the three primary colours, realizing in short term that each paint brand has its own primary colours and that, with each set of three colour-pigments, only a limited range of tones is obtained; additional tints are normally required for tones outside this range. The aims of this study is to undertake a survey of colour theory concepts and to propose an alternative system, based on nine colours: two yellows, two blues, two reds, one white, one black and burnt umber, using the Artist's Watercolours from Winsor&Newton.