Basic copper paratacamite or atacamite, is found in analyses of green pigment samples from surfaces as late as the end of 12th dynasty, but recent investigations led to the conclusion that atacamite may be a degradation product of artificial copper pigments, and that only a few examples of green earlier than the new kingdom were applied as green (Lee and Quirke, 2001). Chemically, salts in reaction with the pigment components play a catalyst role in the discolouring phenomenon (Moussa and Ali, 2013). Concerning other pigment materials; it has been observed that the red pigment is suffering serious problems related to its fragility and stability, the pigment is cracked and has lost its cohesion and consistency (Fig.5), in other places; red pigment is lost due to cracks in the limestone support itself (Fig.6).