Jännesaippua

Jännesaippua, also known as "animal soap" or "hide soap" in English, is a traditional cleaning agent used primarily in the processing of animal hides and skins. Its origins are deeply rooted in historical tanning and fur dressing practices. Jännesaippua is typically made from animal fats, such as tallow or lard, and an alkali, traditionally lye derived from wood ashes. The saponification process of these ingredients creates a natural soap.

The primary function of jännesaippua is to degrease and clean animal hides, removing blood, dirt, and residual fat. This cleaning is a crucial step before further processing, such as tanning or curing, can take place. The soap helps to prepare the hide for these subsequent treatments, ensuring a more effective and durable final product. Historically, it was a common item in households involved in hunting, farming, or small-scale leatherworking.

While the advent of modern chemical cleaning agents has largely replaced jännesaippua in industrial settings, it is still utilized by some traditional craftspeople, hobbyists, and in regions where natural or historical methods are preferred. Its effectiveness lies in its natural degreasing properties, derived from animal fats. Modern formulations may vary, but the core principle of using saponified animal fats for cleaning hides remains consistent with its historical use. The term itself, "jännesaippua," directly refers to its application in preparing animal tissues, including tendons and hides, for various uses.