Old books could be republished in this manner easily and without great cost. New ones also. I needed only to invent a fatty ink, similar to the printing-ink and drying thoroughly, and I could use every sheet of printed paper instead of type. I invented this ink soon. Resin, finely pulverized litharge of silver, lampblack, thick oil varnish, and potash properly diluted with water gave me a good ink for the purpose. The only obstacle that prevented me from using this process at once on a large scale was the fragility of the paper, which tore into pieces under the slightest carelessness in handling. The natural and simple thought that was bound to come to me under the circumstances was this, Could not a stronger material, perhaps the stone plate itself, be so prepared that it would take ink or color only on the parts covered with fatty ink, while the wet parts of the stone resisted it? I feared that the stone might not absorb the grease sufficiently, and this really is the case with many stones, such as slate, pebble, grindstone, glass, porcelain, etc.; but experiments showed that exactly the opposite is true in the case of the Solenhofer limestone. This stone has a great affinity for fat, which often is absorbed so deeply that in many cases even extensive grinding will not remove it.
I took a cleanly polished stone, inscribed it with a piece of soap, poured thin gum solution over it and passed over all with a sponge dipped in oil color. All the places marked with the fat became black at once, the rest remained white. I could make as many impressions as I pleased; simply wetting the stone after each impression and treating it again with the sponge produced the same result each time. The impressions became somewhat pale, because the color on the sponge was too thin; but I obtained perfectly black and handsome impressions as soon as I used an ink roller of leather stuffed with horse-hair.
I hurried to write a sheet of note music at once to print it in the new way; but the ink flowed too much on the polished stone. Previously I had corrected this by rubbing the stone with linseed oil or soap-water, which checked the trouble entirely. But I knew that I could not do that in this new method, because then the stone would have a coating of grease all over, and would take color on the entire surface. However, I was able to take this coating away after writing, by etching with aqua fortis, though etching would not have been necessary otherwise in this chemical form of printing. However, it was easy to see that a drawing etched into relief would be easier to print from than one not etched at all. It did not require much etching, and I saved a great deal of acid, while the stone, also, remained useful for new work for a much longer period. Therefore, without making further experiments, I adhered to my old method, first washing the stone lightly with soap-water, drying it well, writing on it with wax ink, and then etching with acid before I finished it for printing by pouring gum solution over it.
At first I imagined that I might do without the gum entirely; but I found soon that it really formed a sort of chemical union with the stone, making its pores more receptive to the grease and closing them more effectively against water. I found also that neither aqua fortis nor gum was so valuable alone as when both were used in the process.
I needed to make only a few more experiments to obtain the proper consistency of ink, and the new process would be practically perfect so far as the fundamental principle was concerned. And, in fact, I made such handsome, clean, and strong impressions after three days of trial that few better ones have been made since. Now it was necessary merely to train skillful workmen and artists as quickly as possible for this new art, that was susceptible of innumerable valuable uses, as I could see at once.
It made no difference now whether the design was worked in relief or intaglio, as good impressions could be obtained even when the drawing was perfectly level with the surface of the stone. But all three methods could be combined on one stone, if desired. If I reversed the method, by rubbing oil over the stone instead of water, while for printing I used an ink prepared with gum solution (of which I will describe the best composition afterward), then the greasy places would resist color while the wet ones took it, and thus I could print with all water colors, and this is necessary sometimes with colored pictures because of the greater height of the colors. The inscription with dry soap gave me the logical idea toward crayon work, which I used afterward. My previous experiments with etching, that recurred to my memory, now assumed entirely different aspects and I could understand many things that had puzzled me then.
It was a simple step now to the etched method, in which the stone is prepared first with aqua fortis and gum, after which the design is engraved in intaglio without first being treated with aqua fortis. Indeed, this method was used for the first work that I undertook.
A piece of music by Herr Gleissner (which afterward was greatly praised in the musical paper) had been completed before I invented the new process. Only the title-page remained to do. As I wished to make this as handsome as possible, since Herr Gleissner intended to dedicate the work to Count von Törring, I chose this new intaglio style, because I hoped to do my best work in it. Any one who still possesses a copy of this symphony can see by slight examination that the printing was done from an etched engraving. Therefore Herr Rapp in Stuttgart is mistaken when he assumes that he is the first who treated the stone in this manner. As early as the year 1800 I deposited in the archives of the Patent Office in London a full description of this and several other methods, some of which have not been used yet generally, and in 1803 I had to submit my descriptions to the Austrian Government when they gave me a franchise.
A year before this, I had invented the lever press, with which I could make several thousand of the handsomest impressions during a day. This, combined with the new treatment of the stone, enabled me to enlarge my operations greatly. I took in two of my brothers, Theobald and George, who had been in the theatre hitherto, and taught them to write and etch on stone. Also I took in two boy apprentices, sons of poor parents, to train them properly. Herr Schulrath Steiner and Herr Falter, with several others, gave me various orders, and a pretty good outlook began to appear for me and Herr Gleissner.
Until now we had been forced to suffer much grief, disappointment, deprivation, and poverty. Herr Gleissner's salary was only three hundred gulden a year. A yearly deduction of one hundred gulden was being made from this by the Government to pay debts. Then there were new expenses to repair the printery and keep it in some sort of order. My support and that of the family Gleissner,—which consisted of five persons,—then a larger residence, on account of the room needed for stones and for printing, also had to be paid for. My own yearly earnings were barely a few hundred gulden, as most of my time was used for experiments. It is no wonder, then, that during this sad period of two years, we spent almost all that could be spent of Herr Gleissner's estate, and still made new debts, despite all imaginable economies.