Crossword-Solution: CUPRO 5 letters, 4 clues 🏆 scrabble score: 9

When the spectrum is made to act on paper which has been previously darkened, by exposure to sunshine under cupro-sulphate of ammonia, the phenomena are materially different.

Ferro-manganese.--Cupro-manganese.-- Manganese bronzes.--Metallic manganese.--Manganese German silver.--Phosphorus bronze.

For this purpose during these last years real cupro-manganese has been prepared, occupying the same position to copper as the spiegel or the ferro-manganese does toward the manufacture of steel.

This metal is white, crystalline, when exposed to the damp air slowly oxidizes, and readily combines with copper to form the _cupro-manganese_ of the variety having the composition-- Copper 70 Manganese 30 Cast in ingots or in pigs it becomes an article of commerce which may be introduced in previously determined proportions into bronze, gun metal, bell metal, brass, etc.

However, notwithstanding the use of cupro-manganese, the tin, as in ordinary bronzes, has a tendency to liquate in those portions of the mould which are the hottest, and which become solid the last, especially in the case of moulds having a great width.