[495636483]

Also standardize the composition and coloring. That's the major problem with recycling. I say transparent and one opaque variant for photoprotection.

[oblio]

I have included composition in my description ;-)

And coloring, well, a part of it would be composition and the rest should IMO temporary marketing coloring on top of the base composition (i.e. paint the bottle with something biodegradable).

Color should not be part of the standard as it would make the "support matrix" unsustainable and companies should not be allowed to "pass the buck" back to us consumers.