Logan Oplinger on tue 9 jan 01
Regarding vinegar and testing pH, some pH papers have greater sensitivity=
over short pH ranges. Vinegar is about 5% acetic or ethanoic acid. A v=
ery dilute solution of vinegar and water, 1/100 or more, would have a pH =
near that of water, 6.5-7.5.
Small variations in pH can greatly affect the interaction of glaze materi=
als, depending on what those materials are. Some materials may act as na=
tural buffers, offsetting the effect of acids or bases added to the batch=
, while others (such as whiting or dolomite) will react with and neutrali=
ze acids like vinegar.
pH papers of different sensitivities & ranges can be found in science sup=
ply catalogs. Try
Carolina Biological Supply at
https://www3.carolina.com/onlinecatalog/Templates/Default/mainscreen2fram=
e.asp?workspace=3Dhome&button=3Dhome
or Sargent/Welch
http://www.sargentwelch.com/html/corr/ezbio.html
Regarding an earlier post about raku and face shields, I have found these=
additional sites with information and products:
http://arbill.com/catalog/details.asp?sHeader=3DAotuffmaster=99%20Deluxe%=
20Faceshields&sBreaker=3DPersonal Protection&sSection=3DFace Shields
https://www.leonardsafety.com/cgi-bin/leonardsafety.storefront
http://www.gatewaysafety.com/faceshields_face_protection.htm
http://www.wardburner.com/protective.cfm
http://www.mifco.com/scstore/
http://www.auralens.com/glassworkers.html
Good reading
Logan Oplinger
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