What was the composition of paint in ancient times?

Anciently it was mainly resin.

Nowadays, the main components of paint include the following five major parts:

(1) oil: including dry and semi-dry oil, is one of the main film-forming substances.

(2) Resin: including natural and artificial resins, is also part of the main film-forming substances.

(3) Pigment: it includes coloring pigment, body pigment and antirust pigment, the specific varieties are quite numerous, and it is the secondary film-forming substance.

(4) Diluent: including solvent and diluent, used to dissolve the above substances and adjust the consistency, as the auxiliary film-forming substance.

(5) auxiliary materials: including drying agent, curing agent, plasticizer, moisture-proof agent. Also belongs to the auxiliary film-forming substances.

Decorative coatings are mainly composed of three parts:

Main film-forming substances: also known as adhesives and fixing agents, is the basis of the composition of the coating.

Secondary film-forming substances: also constitutes a component of the coating film, but it can not leave the main film-forming substances and constitute the coating film alone.

Auxiliary film-forming substances: these include solvents and auxiliary materials. The former, such as gasoline, cigarette oil, rosin, benzene, ethyl acetate, acetone, etc.; the latter, such as curing agents, emulsifiers, tackifiers, catalytic agents, wetting agents, dispersants, defoamers, initiators, catalysts, stabilizers, antioxidants, antifreeze and so on.