As noted in Resource Recycling, not all glass is created equal when it comes to recycling. Not only does glass color matter, but the opacity, ie, the ability of light to pass through glass matters as well.

What is encouraging is that the cosmetics industry, the industry that often has glass with the lowest opacity, is at least looking to make their containers more easily recyclable. This is what is needed across the board in containers…work to make it easier for recycling to occur at a reasonable cost.

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Design for recycling in cosmetic glass packaging