Linoleum is made of linseed oil, pigments, pine rosin and pine flour. Linoleum is manufactured by

oxidizing linseed oil and adding the other ingredients to form a thick mixture called linoleum cement. According to the Columbia University Press, "linseed oil is exposed to the air in a succession of thin films until it is of a rubbery consistency, or it is thickened by heating until it becomes a spongy mass, after which it is ground, mixed with pulverized wood and other ingredients, and then applied to the foundation and rolled smooth. The final process is a thorough seasoning in drying rooms."