re: #137 klys

My guess is because the addition of the cobalt ion into glass results in that beautiful deep blue color we call cobalt blue (for reasons related to crystal field theory). It doesn’t require an awful lot of it either - less than a half a weight percent.

It also speeds spin-spin relaxation times for NMR spectroscopy, so all my glass samples were cobalt-doped.

There’s your random science for the day.

Here’s your random art: The little girl having her swim suit tugged by the dog in the sun tan commercials is named “Cobie”. Cobalt Blue was the favorite color of her mother, the artist.