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There are many other aspects of the art of alchemy. I cannot tell you them in the correct order – I am not that learned – but I will mention them as they come to me. I will not be able to put them in their proper categories, of course. Let me see. There is red clay known as Armenian clay, although it does not come from Armenia. There are green verdigris and white borax. Then there are the various vessels that we use for our distillation and purification, some made of clay and some made of glass. We have flasks and retorts, phials and tubes, crucibles and alembics. There is no need to mention all of them. They were expensive enough, but they were all useless. Have I mentioned the red waters or the gallstones of a bull? Then there is sal ammoniac. And the arsenic. And the brimstone. Do you find it confusing? I could go on all day about the various herbs we use. There is agrimony, which smells so sweet; there is valerian, and there is moonwort.

So we toiled over the coals and crucibles all day and all night, with the lamps burning around us. The furnace was at full blast, and we heated the liquids to their various boiling points. We used unslaked lime as a caustic, as well as chalk and the whites of eggs; we had powder ground out of ashes and dog shit, piss and clay; we made fires out of wood and out of charcoal; we sprinkled purified salt and vitriol, and then mixed in alum and brewer’s yeast, the hairs of men and of horses, the grease of a sow and the sweat of a red-haired child. Sometimes the amalgam turned yellow, and sometimes silver white. We would fuse and ferment, diffuse and distil.

Let me explain to you the nature of the four spirits and the seven bodies, as my master taught them to me. The first spirit is mercury or quicksilver and the second is orpiment of golden hue; the third spirit is sal ammoniac, the moisture of volcanoes, and the fourth is brimstone. The seven bodies are as follows. The sun is gold, and silver is the moon; Mars is iron and Mercury, of course, is quicksilver; Saturn is lead and Jupiter is tin. The seventh, Venus herself, is copper.

Whoever practises this cursed art is doomed to failure and ruin. He will sell all his goods and come to no good. There can be no doubt that he will lose everything. So come forward, budding alchemists, and try your luck. If you have money to burn, then stoke up the chemical fires. Do you think that it is an easy craft to learn? Not so. You can be a priest or canon, monk or friar – I promise that you will not have scholarship enough. You can study all the texts, night and day, and still go nowhere. The mystery is too deep. For a layman, it is impossible to unravel. It makes no difference whether he is learned or not, he will fail in either case. Alchemy is too difficult.

Oh, I forgot to mention the acids we use, with the metals and oils. They help in the hardening or softening of the materials. They can also be used to cleanse and purify – you need more than a book to understand these things. No more words now. I have named things that should not be named. I have said enough to raise a fiend, the ugliest in hell.

The object of our quest is the philosopher’s stone, the magic elixir. If we possessed that, we would be safe from sorrow. But our labours have proved worthless. I swear to God that, for all our craft and care, the stone will not come to us. The loss of time and money has brought us close to madness. But still there is that hope, that yearning, which keeps us searching for the key. If we have that, we have everything. So you see that the craving can never be satisfied. It is a sharp spur, always pressing us onward. We will never let go, we will never slacken. The quest is lifelong. In hope of future glory, we are willing to forsake everything else. We can never turn our backs on the metals and the crucibles. Although we may only have a torn sheet to cover us at night, and a rough coat to wear by day, we will still spend everything we have on the pursuit of the elixir.

These alchemists smell of sulphur and of brimstone. Wherever they go, they stink like goats. Their odour is so hot and rancid that you can spot them from a mile away. So you can always recognize them from their smell and from their threadbare clothes. If anyone asks them privately why they look so shabby, they have a simple reply. If anyone knew our identities, they say, we would be killed for our secrets. Hush hush. So they deceive the innocent.

Well, enough of this. I will get on with my story. Before we place the pot upon the fire, my master tempers the various metals. Only he can do this – now that he has gone, I can speak freely – and only he knows all the virtues of the lead and silver. He has a fine reputation among the cognoscenti, believe me, although there have been many times when he has come to grief. How does that happen? There are occasions, for example, when the pot explodes or falls to pieces. These metals are so volatile and violent that they can pierce the walls. We have to strengthen the stones with lime and mortar. They sink through the floorboards, or they fly up to the ceiling. Sometimes they just lie scattered on the floor. The expense is terrible. I have never seen the devil, but I am sure that he is somewhere in that room with us. There could not be more violence, or anger, or strife, or sorrow, in hell itself.

When the pot exploded everyone blamed everyone else. Everyone started to fight. Some said that the pot was left on the fire for too long. Some said that the bellows were not strong enough. Then everyone looked at me, because that is my department. ‘Not true,’ said a third. ‘The metals were not mixed correctly.’ ‘Bollocks,’ said a fourth. ‘Stop squabbling and listen to me. The fire should have been kindled from logs of beech, not logs of oak. That is the reason.’ I could never tell who was right or wrong. I only know that the argument went on and on.

‘Enough,’ said our master. ‘What is past cure is past care. I will be more vigilant next time. I am sure that the pot was cracked. That was the cause of the trouble. Well, let it go. Don’t get depressed about it. Cheer up. It’s not the end of the world, is it?’

Then all the debris was swept up in a heap. We put some canvas sheeting on the floor, and piled the debris on to it. Then we picked through the pieces of metal and chemicals, looking for anything we might retrieve. ‘Look,’ one of our number said, ‘there is some of the metal. It is not intact, but we can still use it again. Things may have turned out badly this time, but we will succeed in the end. We have to trust our luck. No merchant is prosperous all the time. There will be occasions when he loses his cargo at sea, and there will be occasions when he sees it safely landed.’

‘All right,’ our master said, ‘you have made your point. I will make sure that everything is done properly next time. If I am wrong, then lay the blame on me. There was something the matter, I know that much.’

Then the argument began again. One man said that the fire was too hot, for example. Hot or cold, it never worked. We never got the desired result, however hard we tried. Still we carried on with the madness. We were lunatic with greed and desire. When we were all together, we looked on one another as Solomon the Wise. Have you heard this proverb – ‘All that glisters is not gold’? Not every apple is good for eating, however sweet it looks. So it was with us. The greatest fool among us was deemed to be the wisest. The most honest and honoured was in fact the biggest thief. You will learn the truth of this before I leave your company. Just listen to my tale.