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I remember seeing someone talking about pipes and recommending white pipes for hot water, because you can’t recycle plastic into white color and recycled plastic had less thermal resistance (isn’t that white pipes had more thermal resistance, but that white pipes are probably not recycled).
That’s a regulated thing already, you can’t just decide to use one color or another, pluming regulations have designated use for black pipe, blue pipe, white pipe, that I’m aware of, but I couldn’t say exactly, I only sold the stuff, I just know when a contractor says ‘‘I need [color] [material] [size]’’ there’s no alternative pipe they can use.
No everywhere have the same regulations.
Hence