Stones contain different minerals like dolomite, calcium, quartz, feldspars etc. and these colorless minerals when combined during several stages of stone formation create this kaleidoscope of color of stones. Any kind of light, specially sunlight can really reflect the true colour of a particular stone and some stones have distinct respond when exposed to different shades of light. When wet, the colours are brought to life. Modac, especially, looks wonderful in the cool English light of winter when soft landscaping is fading into its autumnal and wintry state. It is a shade to choose if you want to bring a warm Mediterranean appearance to your garden

As stones contain lots of minerals, the color of a stone might change or fade due to natural weathering and
use of chemicals.

i)        Natural Cuase: Nothing is eternal, more so for natural stones. The natural weathering weathering process and the ultraviolet rays from the sun may cause the color of stones to fade slowly. Limestones and black marbles are examples.

ii)        Chamical Cleaning: Use of acidic cleaning materials is necessary to maintain natural stones. But stones are very sensitive to acids and alkaline cleaning solutions and excessive use of them cuase fading effect on stones. So you must be careful not to use too much of acidic and alkaline solutions on natural stones.

iii)       Sometimes, the optical qualities of natural stones can be changed by etching their exposed mineral surfaces.

---