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Black vinyl is coloured, it's just that the colour black was chosen partly because it improved the quality of the pressing.
I'm not sure whether it's just been a case of coloured pressings not getting the same time taken over them in the past or there is a chemical reason, the pigments cause surface noise maybe.
It's a really big subject and I'm not going to do it justice in a few posts. One thing I have discovered with vinyl is experience teaches you a lot. Handle a lot of records and you can start to get an idea where it might be pressed, whether it was done cheaply, all those kind of things. One thing you almost never see is an audiophile pressing in anything but black.
I see, thank you.
However i was actually wondering about the difference between black vinyl and non-black vinyl, not about EP's and LP's / 45 and 33.
To put it another way: why can't you press the same way in coloured stuff as you can in black stuff?