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On 6/25/2018 at 1:10 PM, studiot said:

Industrially manufactured CDs have pits which are mechanically pressed into the plastic by a metal master.

User recordable CDs don't have physical pits. They incorporate a chemical layer which undergoes a local chemical change when 'burned' with the laser writer. These have different optical properties and are equivalent to the pits, but can degrade over time or heat or high levels of illumination.

You would have to experiment with a CD or piece of one to see if it is specular enough for your purposes.

What's a master?

Also thanks.

True.

Do their molecules bind or something?