David Yuile and his brother William attempted to control the Canadianglass manufacturing sector by founding the Diamond Glass Company, which did not make any glass?
Question 4: ________, together with carbon and iron salts, is used to form iron polysulfides and produce amber glass ranging from yellowish to almost black.
Question 6: Thus, ________ in glass may be obtained by addition of electrically charged ions (or color centers) that are homogeneously distributed, and by precipitation of finely dispersed particles (such as in photochromic glasses).