In Strasbourg, Johannes Gutenberg, a goldsmith, working with partners, produced small cast metal mirrors for the "great Aachen pilgrimage." As many as 100,000 of these mirrors were cast from a mixture of lead, tin and antimony—the three basic ingredients that Gutenberg later used in the casting of metal type. The Aachen pilgrimage of 1439-40 was postponed because of an outbreak of plague.
Much of what is known about Gutenberg comes from the collection of 28 legal documents that mention him by name. These records were transcribed verbatim before the originals were destroyed in a fire in Strasbourg in 1870. The documents were first published in Festschrift zum fünfhundertjährigen geburtstage von Johann Gutenberg, im auftrage der stadt Mainz, 1900. A revision and amplification of two of the texts was published in Gutenbergfestschrift zur feier des 25jährigen bestehens des Gutenbergmuseums in Mainz, 1925. The documents were translated into English in McMurtrie, The Gutenberg Documents. With translations of the texts into English, based with authority on the compilation by Dr. Karl Schorbach (1941).
Lehmann-Haupt, Gutenberg and the Master of the Playing Cards (1966) 58-60.