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Perhaps this is unnecessary but a word of caution would seem to be in order 
when using some of the ingredients.  I know some are toxic and using a mask 
and gloves might be a good practice until you know what might be dangerous 
alone or mixed with other things.  The advice to check with the local 
chemistry department at a college or university might well prevent a bad 

Claudia Stall, Head
Collection Preservation/Mendery
San Diego State University Library

Be kind, do good work, and touch the earth gently.

(619) 594-2591

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