Question

how is stained glass made?
a. adding metallic oxides to sand and ash or lime, then infusing at high temperatures
b. adding metallic oxides to salt, then infusing over time at low temperatures
c. adding metallic oxides to sulfur, then infusing at high temperatures
d. adding metallic oxides to sulfur, then infusing at low temperatures
please select the best answer from the choices provided

Explanation:

Stained glass is made by adding metallic oxides to a base of sand, ash (or lime) and then heating (infusing) at high temperatures. Option a matches this process. Options b, c, d use incorrect bases (salt, sulfur) or incorrect temperature conditions (low temperatures), so they are wrong.

Answer:

A. adding metallic oxides to sand and ash or lime, then infusing at high temperatures