Editing Varnish (section)

==Safety==
Because of flammability concerns, many product containers list safety precautions for storage and disposal for varnishes and [[drying oils]] as they are flammable, and materials used to apply the varnishes may spontaneously combust. Many varnishes contain plant-derived oils (e.g. [[linseed oil]]), synthetic oils (e.g. [[polyurethane]]s) or resins as their binder in combination with organic solvents. These are flammable in their liquid state. All [[drying oils]], certain [[alkyd]]s (including [[paint]]s), and many [[polyurethane]]s produce heat (an [[exothermic]] reaction) during the [[Curing (chemistry)|curing]] process. Thus, oil-soaked rags and paper can smolder and ignite into flames, even several hours after use if proper precautions are not taken. Therefore, many manufacturers list proper disposal practices for rags and other items used to apply the finish, such as disposal in a water filled container.<ref>{{citation |title=Marine Fire Prevention, Firefighting and Fire Safety |publisher=DIANE |year=1994 |page=91 |chapter=Paints and Varnishes |isbn=9780788104787}}</ref><ref>{{citation |url=https://www.esfrs.org/black-museum/all-the-black-museum-cases/spontaneous-combustion-of-linseed-oil/ |work=Black Museum |title=Spontaneous combustion of linseed oil |publisher=East Sussex Fire & Rescue Service}}</ref>