EXTRACTION OF THE SALT OF PLANTS
Pick 5kg or more of Rosemary (Rosmarinus Officinalis), or of another plant that you choose and dry it in the sun. After it becomes very dry, incinerate it on a sheet of iron.
Gather the ashes and place them in iron frying pan and place on a gas stove. Calcine them with a very strong fire for one hour, stirring the ashes with a stainless steel spoon, so that they become well calcined and of a clear grey colour. In a 1litre large-mouth flask, pour in 750ml of rainwater. In increments, add the ashes while still hot.
If you observe that there is not enough water to leach all the ashes, add water until it is sufficient. If one flask is not enough, divide the ashes between two or three. It is necessary that the water is more than a hands-width above the ashes. Stir well with a glass rod and let rest for one hour.
In another similar flask, place a glass or plastic funnel with a small cotton lid. If the ashes have been calcined as Art demands, the water of the lixiviation will be clear and transparent; otherwise, it will be the colour of tea.
For decantation, pour the water of the lixiviation in the funnel, and when everything has drained, add the ashes with a stainless steel spoon. When the whole liquid has been drained, put some rainwater on the ashes to extract any salt that may remain in them.
Pour the liquid lixivied in a porcelain container and coagulate the salt in bath of sand in an electric or gas oven. Toward the end of the coagulation (crystallization), the thick liquid will create a superficial film, which will impede the evaporation of the water.
Therefore, when the solution arrives at this point, we recommended mixing well with a glass rod, to undo the superficial layer of the salt. The coagulated salt should be as white as snow.
If it is not white, you will have to calcine it again in a stainless steel porringer, with a very strong fire and dissolve it in rainwater again as before. The secret to extracting the white salt the first time is the calcination of the ashes. Do not be in a hurry in executing this operation, because if it is done properly, it will save much work.
We met an artist personally whose pretension and arrogance was humbled to the degree which characterises true alchemists. On a certain occasion, we had the opportunity to show him plant salts that were white as snow and coagulated according to the Art. When we told him that it had been extracted from the first calcination, he didn't believe it, even though he proclaimed wisdom of the Art and had never accomplished this on the first crystallization.
When we revealed to him the modus operandi, he remarked that we burned the sulphur of the salt! It goes without saying that this answer demonstrates a gross ignorance of the Spagyrical Art.
This fixed salt is basically potassium carbonate, but also contains in small amounts, other mineral salts in dissolution in the plants and probably some oligoelements.
The salt of these plants will serve also in the preparation of the First Being of the referred plant, after you have extracted the sulphur or essential oil.
If you intend to obtain exclusively, potassium carbonate or salt of tartar, as it was well known formerly, we recommended to incinerate a large amount of grape-wine, acacia, fern or oak, which are all rich in potassium salts.
You will able to calcine the crude tartar of wine barrels, in which the ashes, once extracted by the same process described herein, result in a beautiful salt of very pure canonical tartar. Store the salt in a well sealed large mouth glass flask, to avoid absorbing the humidity of the air and altering it's nature. Salt of tartar well calcined, is much deliquescent.
To see pictures: Plants Salt and Ashes