KOH-I-NOOR Hidden Diamond Ash Automatic Clutch Pencil 5.6mm

In 2020 the KOH-I-NOOR HARDTMUTH Company celebrates 230 years since its founding. The company, which was established by Joseph Hardtmuth in 1790, originally produced stoneware and building materials because Joseph Hardtmuth was a very proficient architect and builder. His work includes the very beautiful Lednice-Valtice complex of the Lichtenstein Chateau on the South-Moravian estate, but his work is much more extensive and his fame even gained him the interest of Napoleon. Joseph Hardtmuth was a typical inventor, he developed several types of building material and stoneware and even the modern lime-sand brick and the technology for its production. His profession placed great requirements on drawing. However the drawing tools at that time were only the handmade and therefore very expensive and poorly available English pencils or unsatisfactory German pencils, both made of a single piece of graphite. As a competent constructor Joseph Hardtmuth combined his knowledge and technologies used in building materials manufacturing and developed a pencil lead based on a mixture of clay and ground graphite along with, and this was fundamental, the revolutionary technology for series production. The basis of this technology is still used by all pencil lead manufactories worldwide.