Why do some colors come in opaque rods/tubes but are translucent when pulled?

Home Frequently Asked Questions (FAQ) Glass Information Why do some colors come in opaque rods/tubes but a....

This is because of the minerals in the color.   The thinner the minerals get in the glass the thinner the minerals get thus making the color look see-through or transparent.

At a molecular level, we are all see-through.

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