How to say darkening in different languages

You can say darkening as schwärzen, brünieren in the following countries: Austria; Germany; Liechtenstein; Switzerland;

You can say darkening as annerimento, niellatura in the following countries: Italy; San Marino;

You can say darkening as чарненне in the following countries: Belarus;

You can say darkening as černění in the following countries: Czechia;

You can say darkening as чернение in the following countries: Russia;

You can say darkening as siyah in the following countries: Turkey;

You can say darkening as чорніння in the following countries: Ukraine;