You can use the technique called chromatography.
So they could have different colours. Nobody wanted everything hemp coloured.
no it could not
Stacked bars, with a different coloured stack for the three categories: gold, silver and bronze.
As they could spread the word in two different places , so it was good.
You could do a survey or ask people you know to choose a piece of food out of a group of different coloured foods
possibly yes but you could type in in google images 'disney colouring' or '(whatever topic) colouring' and print off the picture to colour in yourself
if they're miscible and have different boiling points, you could use fractional distillation.
Food colouring typically has no taste, so yes, you probably could add it to wine with no noticeable change of flavour.
its not pure substance its mixture
It separated people into different social classes(Peasents/serfs, Kings/Queens, Lords/Archbishops, Knights) and they could tax different amounts to different people.
From what
Glucose is not a metal and can not be separated using a magnet.