Delta Metal

Alloy of zinc and copper to which has been added a small amount of spiegel-eisen. Used in ornamental work and in making rolls to crush powder, as it is not liable to give rise to sparks as steel does. Its properties are similar to phosphor-bronze. It is yellow; sp. gr. 8.4: mpt. 950° C. Its tensile strength is stated to be when cast 53,200 lbs., rolled 86,000. Delta pur purine. C,H,NOS, Na, Sodium salt of the product of the action of diazo ortho tolidine on the ẞ-naphthylamine sulphonic acids: red powder, which dyes cotton red without a mordant.