Table 5 – Chromophores chemical elements for glass bottle industry cited by Couri et al. (2020).

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Coloring element	Oxidation state	Main color
Copper	Cu^2+	light blue
Chrome	Cr^3	green
	Cr^6+	yellow
Manganese	Mn^3+	violet
	Mn^4+	black
Iron	Fe^3+	yelow-brownish
	Fe^2+	bluish green
Cobalt	Co^2+	deep blue or pink
	Co^3+	green
Nickel	Ni^2+	brown, yellow, green, blue…
Vanadium	V^3+	green, brown
Titanium	Ti^3+	violet
Neodymium	Nd^3+	yellowish violet
Praseodymium	Pr^3+	light green
Gold	Au^o	ruby
Cadmium	CdS, CdSe	orange