Can opaque glass be tempered

The frosted, textured windows sometimes over the tub in the bathroom…you cannot see the tempered glass stenciled marking. Is it even possible to temper this type of glass?

Yes, almost all obscure or decorative glass can be tempered.

How would you confirm that it is?

There is no surefire way to tell without the logo etching in the glass.

Give a good smack and find out!:twisted: