Seals For The Goetic Presidents? Options

Sorry if this has been asked before, but I didn't see it.

Various copies of the Goetia refer to Mercury as the metal of the Presidents, which is all well and good, until you get to the point with the Spirit when for whatever reason you are supposed to, or want to inscribe its Seal upon the appropriate metal. Copper, Tin, Silver, no problem. But how am I supposed to inscribe on Mercury?

I've been considering brass, as it is also attributed to Mercury, or an alloy with Mercury, but I was wondering if anyone else has another idea/suggestion.

Since I am learning spagyrics, I like this answer the best:

This is a detail of the conventions of terminology used by Alchemists. If something is referred to as “Philosophical Gold”, or “Philosophical Silver”, etc, it does not mean literal Gold or Silver. Instead it refers to a substance which has the “signature” of Gold or Silver upon it. Likewise for Philosophical Lead, Philosophical Tin, etc. By carrying out the Alchemical process in the Spirit in which it is intended, we are able to put this “signature” on to the substance in question.

This potentially unlocks a puzzle of the old grimoires. It was said that to make the seals of various spirits one should use the Metals of the Planets to which those spirits are ascribed. But … how exactly does one make a Seal out of, say, Quicksilver? To the Alchemist, the answer now becomes blindingly obvious. Take a piece of parchment, and soak it in a Tincture that you have made from a herb which is under the presidency of the planet Mercury. Remove the parchment and allow it to dry. You have turned the parchment into a piece of “Philosophical Quicksilver”, and as such you may use it to create the Seal of the Mercurial spirit if you so wish. This is but one application of Alchemy to the problem. It is also possible in the Metallic Work to take actual Quicksilver, and create a safe, non-toxic and even beneficient tincture from it. This too would serve purpose admirably. This is sure the true method of using “fluid condensers” in magic: the version proposed by Franz Bardon is only a pale imitation

Here's the link:
http://www.jwmt.org/v1n9/prima.html

This post has been edited by flyingmojo: Nov 23 2007, 10:21 PM