Bamboo salt is most exclusively made in Korea, and typically in connection with a monastery... it originated there in the Taoist monasteries about 1500 years ago. It was a discovery of alchemical experimentation, but was found to be a type of universal medicine. I have heard it called 'red ormus'. However, it is a kind of reverse methodology. Whereas in the wet method, we derive or precipitate trace minerals from salt and salt water (by a chemical process), a way of getting the good things out of the salt so that we can use them. The Taoist monks did the reverse in a burn methodology.
The Taoist Monks proceeded to fuse as many trace minerals 'into' the salt as they could, rather than separate them out. On the northeast of the Korean peninsula, a special very hardy species of bamboo grows, and it grows in a yellow mineral-rich alluvial clay, called Loess clay. This yellow clay is near the cold rocky, windy seaside bathed continually in sea spray. A very willowy knotty species of pine also grows in the area. The Monks discovered that if they packed dry sea salt into a joint section of a large fresh-cut bamboo, capped the top with a wad of moist Loess clay for a lid, and then burned it in a pine-knot fired Loess Clay kiln, the minerals from the bamboo (as it burned at 1700C), the minerals from the pine and the clay fused 'into' the sea salt.
Of course the bamboo burns away, leaving a 'brick' of salt. They crushed the salt, again packed it into another bamboo cylinder, and repeated the process over and over again. They discovered on approximately the 3rd or fourth burn, the salt begins to turn slightly pinkish, as it acquires (collects) more and more fused minerals, nutrients, phytonutrients, phenols and polyphenols from the bamboo, pine, and clay. With each burn the salts get a very slight bit pinker, redder, or lavender colored. Optimum salt, say the Monks, is a 9 times roasted salt. This 9-times roasted Bamboo Salt is available at www.TibetanGold.com as Crystal Amethyst Bamboo Salt, a powerful food.
I know of 4 monastic producers in Korea from my travels there searching for the stuff. Some call it 'Red' Bamboo salt. I don't know if this is to what your question refers. But one thing I found out, and I've been burned once. A few producers may roast the salt three times (to flavor the salt with its distinctive smoky flavor) then artificially color it to make it appear 'redder.' So one should be careful, and know how to tell the difference. The salt will only get so red... and the salt can only acquire a certain amount of the fused minerals, and so if the salt is too red...its gotten that way artificially. BTW... there is also a species of bamboo which is called 'red bamboo,' but it is not the species used to make bamboo salt.
Bamboo Salt is quite powerful and a little bit goes a very long way. Personally, I wet the tip of my finger, dab a bit of the raw bamboo salt, and put it to my tongue and savor the smoky salty flavor... that is enough for me for a day. It has quite a calming effect, and tends to quite immediately clear the mind. The first time I tried 9-times-roasted bamboo salt, I gulped about half a teaspoon... and I completely lost my appetite for a day or two, and my digestive system began flushing out everything in it within a couple of hours. The salt has tremendous detox effects and very quickly.
As mentioned before, one user stated using (half to one) teaspoon) of bamboo salt in his Volixer upgraded blender for a few minutes to give it a vortex spin, which seems to accentuate the spiritual and mental aspects of the bamboo salt. Of course, the Taoist Monks didn't spin it, and emphasized its high curative benefits, calling it the Universal cure for nearly all ailments. They emphasized the detox as its greatest benefit. Several Korean companies make a face cream as it is very good for skin; and tooth pastes because it will heal and restore bones and teeth very quickly. It stops bleeding gums with just a few uses.
The WTO Annual Conference took place in Hong Kong back in December 2005 with its usual massive protests, marches and turmoil. The most violent and persistent protesters were a few hundred 'Korean Farmers' who did many strange and disruptive things in the streets of Kowloon and downtown Hong Kong. About 30 of them were arrested for rioting and destruction of property. They have really resented their arrests and confinement, so they decided to go on a hunger-strike in the territorial prison.
And this 'hunger-strike' is what this post is about. It came out in the HK Newspapers yesterday that before planning the 'hunger-strike' these incarerated Korean protesters made a request of their Korean Embassy... and that request was for a kilogram of 9 times roasted 'Bamboo Salt.' So for the duration of the 'hunger strike' (which is still on-going) these protesters have been taking (sipping) a brine of Bamboo Salt twice a day. Upon their daily medical checks... the HK doctors have reported that there appears no diminishing of their health, but surprising to the HK Drs they appear to be in better, and more alert and coherent, health than when they were first brought in. Just another interesting anecdote on the value of Salt Brine Therapy.