I passed this message on to Dr. Arditti in case he wanted to comment, His reply is this:
"Be sure to tell them that keyhole lubricant graphite may not be pure. They must use chemical grade from a chemical supply house. If they use locksmith graphite they may run into trouble. Also may be darkening is not needed." Cheers...Steve -----Original Message----- From: greig russell [mailto:[EMAIL PROTECTED] Sent: Thursday, 15 July 2004 7:00 AM To: [EMAIL PROTECTED] Subject: [OGD] Re: Orchids Digest, Vol 6, Issue 284/6 As I remember, Graphite was used by Prof Joseph Arditti as a colourant for agar about 30+ years ago when he was working with antimicrobials in culture media which would have been trapped by charcoal. A good source of powdered graphite is puff lubricant for keyholes. regards, greig
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