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

It is  - sand + cobalt oxide + lime + heat

I think is C - sand + cobalt oxide + lime + heat

Explanation:

1. red- the color of blood

2. black- the color of the darkness in my soul

3. white- the color of the clouds

4. orange- a fruit

5. blue- the color of water

hi bored. i'm dad. (kill me)