Are any of these too old to use?

Question

I bought a used kiln that came with the following. There was an old receipt included among all the goodies so I know there materials are from 1996. Some are in bags and some are in jars. My question is, are they good or should I replace any of them before trying my hand at making my own glazes? Thanks for your help! Gaye

Corwell (or Cornwall) Stone Red Iron Oxide Spodmore (trying to read handwriting) F 19 Frit FSJ-200

Dewitt · Accepted Answer

From  FSJ-200 Feldspar  Descrip   Family and Type  Feldspar    Origin None assigned  ChemistryAnalysis Date2001-10-06  Stat Oxide Percent Form +/-   CaO 0.60 0.06     MgO 0.10 0.01     K2O 10.00 0.60     Na2O 3.37 0.31   U Al2O3 18.00 1.00     SiO2 67.44 6.36     Fe2O3 0.08 0.00   Imposed LOI: 0.40  Total: 99.59,  Formula Weight: 564.34  deg

GaSeku · Answer

Great! That's what I was hoping to hear!

GaSeku · Answer

Thanks deg!

Jesse · Answer

Spodmore is probably spodumene...From  is a source of lithis, which is a flux that helps develop copperblues tones in glazes. It can replace feldspar and also reduces thevitrification temperature and shrinkage rate in glazes.Jesse

Linda Clay · Answer

They are all good.  As long as they are kept dry they will last

Are any of these too old to use?

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