English to Italian Tech/Engineering tecniche decorative mediante fusione di metalli

"Bossia" is a deep black metal mixture that is fused onto metal for decorative effect. ...

(PROCESSO DI PREPARAZIONE DI "BOSSIA")
1) It is also possible to fuse bossia into place with a **torch**. Because of the danger of overheating the bossia, the flame is played on the work in such a way that the heat travels from there to the bossia.
2) Prepare the metal as described above, brush on a coat of the ammonium chloride flux and **warm it with a torch**.

TORCH (nel caso 1 serve per fondere, nel caso 2 per riscaldare...)
Torcia, cannello?... Non saprei! Grazie!