Bright Blue First Used to Dye Cement for Pools
This page is the CodyCross answer for the clue below from Making a Documentary, Group 1520, Puzzle 2 (Audience Reception).
Question is: Bright Blue First Used to Dye Cement for Pools
and the answer is: MANGANESE
Word Meaning:
MANGANESE — (uncountable) A metallic chemical element (symbol Mn) with an atomic number of 25, not a free element in nature but often found in minerals in combination with iron, and useful in industrial alloy production.
Definitions from Wiktionary.