Oil-based wood stains and linseed oil can burn without any spark. Oil-based wood stains and linseed oil can combust and burn even without any spark to initiate the fire, officials say.Click to see full answer. Keeping this in view, how does linseed oil spontaneously combust?Linseed oil evaporates very rapidly causing an exothermic reaction, which accelerates as the temperature of the rags increases. When the accumulated heat exceeds the rate of heat dissipation, the temperature increases and may eventually become hot enough to cause the rags to spontaneously combust.Furthermore, is linseed oil bad for your skin? 1) Raw linseed oil is, in fact, flax seed oil. It takes a long time to dry but is entirely non-toxic. It also dries much more quickly (although still more slowly than toxic, commonly-used polyurethanes.) This true boiled linseed oil is also non-toxic. Thereof, is dry linseed oil flammable? When linseed oil combines with air, the oxygen molecules cause a chemical reaction that creates heat. According to the article, if the linseed oil is on something flammable (like a rag you might use to clean your patio furniture), it can catch fire with no outside spark at as low as 120 degrees.What is the difference between raw linseed oil and boiled linseed oil?Boiled Linseed Oil contains metallic driers that accelerate its drying. Boiled Linseed Oil, if applied according to label directions, dries in approximately 24 hours, Raw Linseed Oil dries in 3-4 days.