recipe for an insta-cast, aka recipe for an insta-cast, recipe for insta-cast, recipe for instacast, instacast recipe, and insta-cast recipe
A patent application describing a quick setting cast and bone irradiator for healing limb fractures.
It tells you how to make an insta-cast with the following components:
Making this would take good familiarity with medic and good familiarity with craft.
In the upper right corner is a note: 'First discovered by Dr. Caufman.'
It weighs about 100 grams. It is a medical protocol. You think it might fetch about $2 on the market.