Question

Which of the following is the correct formula in making stained glass?
a.
sand + water + cobalt oxide + lime
b.
water + cobalt oxide + lime + heat
c.
sand + cobalt oxide + lime + heat
d.
Stained glass making does not require a formula.


Please select the best answer from the choices provided

A
B
C
D

Answer 1

C

Reason: Glass is made from silica (sand) with lime (and usually a flux) and colored by metal oxides (e.g., cobalt oxide) melted together with heat — so sand + cobalt oxide + lime + heat is correct.