Do "roundie" color sets make a better picture than later sets?

[old_tv_nut]

Originally Posted by dtvmcdonald

Yttrium has nothing to do with color. Its also not a rare earth,
but rather one slot up in the periodic table from the rare earths.
It has 3+ ions as do the rare earths and it has a similar size,
so it makes a great matrix for doping with rare earths.

Thanks - had no time to look it up and refresh my memory.