Perry

That 15kg of linotype you picked up sounds a bit suspicious to me, you would not normally find linotype in that form unless in an ingot. However if it is about 17mm thick and rectangular with square sides it may be stereotype, not linotype. Stereotype was used as a mount for images in page composition as well as making plates for rotary presses. It is a little harder than linotype 80% lead, 6% tin and 14% antimony, Brinnel hardness 23-24. Linotype is 84% lead, 4% tin and 12% antinomy, Brinnel hardness 21-22. Not much in it but useful when calculating your alloy. Also worth knowing that a lot of lino is probably tired, meaning that tin and antimony content has been run down over the last years of its use in the printing industry.