A paint thinner is a solvent used to thin paints or varnish. Paint thinners are diluents. Solvents labeled "paint thinner" are usually white or mineral spirits.
"Your country needs flax .." US World War II poster soliciting the public for linseed oil for use in paint.
A can of French linseed oil — it is used as a carrier in media like oil paint and varnish making them more fluid, glossy, and transparent.
White spirit or mineral spirits, also known as mineral turpentine, turpentine substitute, and petroleum spirits, is a petroleum-derived clear liquid used as a common organic solvent in painting. There
Paint thinner
…thinner is a solvent used to thin (i.e. make it less thick) paints or varnish. Paint thinners are diluents. Solvents labeled "paint thinner" are usually white or mineral spirits. Certain organic solvents used as paint thinners on painting materials can be harmful in of themselves, as well as through the release of hazard…