..and the yellow pigment dissolved in dil HCl in a quartz cuvette.
Pic as shown
Scanned under tungsten halogen light visible light spectroscopy
No UV transmission in this quartz cuvette detected
Perhaps the pigments have uv blocking properties or otherwise
Oxalic acid to? remove rust is best avoided cos the pigment will dissolve leaving behind a? pale yellow to whitish coat and a yellow solution
This yellow pigment is likely lead chromate painted on a steel container
