When glass is recycled and turned into a new end product, various chemicals are added that have different actions on the starting hue to result in the desired end hue. Sorting makes this color process consistent, so the appropriate actions can be taken on the different types of colored glass.
For instance, green glass will be melted down to turn it into a yellow-green. Then manganese oxide is added to make it turn grey, at that point various dyes can be added to result in the desired color. When glass is brown or amber, zinc oxide will be added which will turn it either blue or green depending on how much is added.
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