The candidates are
1) Acrylic paint:- is a fast-drying paint made of pigment suspended in acrylic polymer emulsion. Acrylic paints are water-soluble, but become water-resistant when dry.
2) Oil painting:- is the process of painting with pigments with a medium of drying oil as the binder. Commonly used drying oils include linseed oil, poppy seed oil, walnut oil, and safflower oil. The choice of oil imparts a range of properties to the oil paint, such as the amount of yellowing or drying time.
3)Natural Colours: In Kerala, traditionally the mural painting colours are prepared from vegetables and mineral pigments. Red is derived from red literate, yellow is derived from yellow laterite, white from lime, and black from soot of oil-lamps. Leaves of Neelamari or Neelachedi plant are squeezed and the extract is used after drying up to be mixed with Eravikkara for obtaining the green pigment. Wooden utensils are used for mixing the
colours and the binding media used is derived from tender coconut water and extracts from the neem tree.
acrylic:- Acrylics haven’t been around long enough for us to really know how much it last. we believe it last as oil paint
Oil paint:- have survived for hundreds of years, so their long-lasting quality is well known. They do tend to discolor with age.
Natural Colours:- Temples, churches and palaces in Kerala display an abounding tradition of mural mostly dating back between the
9 th to 12 th centuries AD
acrylic:- It is a fast-drying paint which makes it cheaper than the other two.
Oil paintings:-oils take long to dry which make it light costlier than acrylic.
Natural Colours:- preparation of colour for mural painting is time consuming.For drying also it required time so it very costily when compared with the other two.