Don, the cauterizing agent that I carry is called "Wound Seal". It is a dry powder in individual packs for small wounds. The material is similar to the wound packs issued to combat medics. We had a seminar at the gun range on how to use the large packs for gunshot wounds (God Forbid). My Wife picked this stuff up at (of all places) the .99 Cent Store, and it is actually made in the USA.
This thread reminded me of a great mini-emergency kit for pack, or coat pocket. It is called "Storm Kit", and is assembled by the Tacoma Mountain Rescue Unit. It contains matches, candle, sugar, salt, bullion, tea, wire, whistle, signal mirror, and plastic tube tarp, packed into an oversized Prince Albert can (tin can for you whippersnappers, who have never seen a PA can), which doubles as a vessel for boiling water. It has been a few years since I bought one, but it was under $10 at REI. We all carried these when we hunted Elk in Colorado, and had an ironclad pact that you never left camp without the storm kit, due to the nature of Colorado's weather.