Solvent  or  thinners  are used in paints  and  lacquery  to reduce   the  viscosity  or  consistency  of  the  material   and facilitate  the  application of a uniform coating. They  must  be compatible  with the oil or resin present. After application  the solvent  is  no longer required and should  evaporate  completely from the film.

A solvent is a liquid which disperses a solid or  semi-solid substance so as to yield a useful solution.

Petroleum  Naphthas, or solvents; have been available  since the commencement of the petroleum industry. They are valuable as solvent non-poisonous character, good dissolving  power,  and favourable  cost. The wide range of naphthas available  from  the ordinary paraffinic straight-run to the highly aromatic types-and the  varying  degree  of  volatility  possible,  offer   products suitable for many uses.

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