Why is it that different colored glass is more expensive than other colors?

So many things affect this.  1 is supply and demand.  New colors cost more because they are new.  Then maybe a batch was destroyed, so that has to be put into the second batch.

The second is that the glass color could be a secret, this is worth more as others do not have it, kinda supply and demand.

The third is the materials used for colorant.