Apart from the two or three bird masks, the only other zoomorphic mask was a wolf frontlet of cedar decorated in micaceous black paint with dentalium teeth, dentalium being an important form of wealth with some of the attributes of a currency.

Curious, I looked it up and discovered that it's in the class of chemicals that were manufactured by 3M for use in Scotchguard, among other consumer products and applications. Perfluorooctane sulfonate (PFOS) received a flurry of attention around 2000, when studies of its effects on animal and human health showed that it was bioaccumulative (meaning that it accumulates in body tissue, especially in fat where it can linger for years), persistent, and toxic to mammals.

[…] four weeks' exposure on grass, two immersions in bleaching liquor with various supplementary boilings and grassings.

The boys couldn't stand idly by while three Wednesdayites got mullered; it was not the done thing.