Silica gel ca be had from Lee Valley
http://www.leevalley.com/garden/page...83&cat=2,50560
John.

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"Lawrence L'Hote" wrote in message
news:ROEee.59565$c24.17142@attbi_s72...

wrote in message
oups.com...
Purina Tidy Cats Crystals, comes in a 3.5lb (1.59kg) container.
Ingredients list is
silica, deoderizing system.

It is made up of mostly clear silica with some blue crystals as well.
The blue crystals also appear to be silica, my guess is they have been
treated with the deoderizing system.

In another life, before teaching I was a research chemist. The silica gel
we
used had blue crystal-like particles that turned a pink color when the
silica gel was in need of drying.
Larry

--
Columbia, MO
www.llhote.com