Important: Safety Warning

This page contains a formula or preparation using substances now known to be dangerously toxic, such as arsenic, mercury, lead, or cyanide compounds. Exposure to these substances can cause severe poisoning, permanent injury, or death.

In addition, this page describes practices involving highly flammable materials in ways that create a serious risk of fire or explosion.

In addition, this page describes trade processes that use dangerously toxic materials such as cyanide solutions, mercury amalgams, or strong acids. These processes require training, equipment, and precautions far beyond what the text describes.

This information has been left in for historical purposes but should not be acted upon.