Re; 232-1,2 calcining Thanks Russel and Ray. Trouble is, silica skeletons are neither reduced, oxidised nor decomposed by heating to less than fusion point although the skeletons may aggregate as dry lumps as in natural induration. My point was more to do with derivation of the term though, which is often (mis)taken to imply 'calc'-areous materials like calcite or limestone. No doubt the advantage for an orchid substrate is that, like rock-wool, it is pretty inert silica and is porous and permeable. Otherwise, what's its attraction? John
----- Original Message ----- From: <[EMAIL PROTECTED]> To: <[email protected]> Sent: Sunday, July 22, 2007 11:00 AM Subject: Orchids Digest, Vol 9, Issue 232 > Send Orchids mailing list submissions to > [email protected] > > To subscribe or unsubscribe via the World Wide Web, visit > http://orchidguide.com/mailman/listinfo/orchids_orchidguide.com > or, via email, send a message with subject or body 'help' to > [EMAIL PROTECTED] > > You can reach the person managing the list at > [EMAIL PROTECTED] > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of Orchids digest..." > > > Today's Topics: > > 1. Calcined (Russell M. Tyler) > 2. Re: Calcined (Ray B) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Sat, 21 Jul 2007 06:58:20 -0500 > From: "Russell M. Tyler" <[EMAIL PROTECTED]> > Subject: [OGD] Calcined > To: <[email protected]> > Message-ID: <[EMAIL PROTECTED]> > Content-Type: text/plain; charset="Windows-1252" > > A Google search resulted in the following: > > "To heat (a substance) to a high temperature but below the melting or > fusing point, causing loss of moisture, reduction or oxidation, and the > decomposition of carbonates and other compounds." > > Russ Tyler, Brainerd, MN > > ------------------------------ > > Message: 2 > Date: Sat, 21 Jul 2007 08:52:12 -0400 > From: "Ray B" <[EMAIL PROTECTED]> > Subject: Re: [OGD] Calcined > To: "the OrchidGuide Digest \(OGD\)" <[email protected]> > Message-ID: <[EMAIL PROTECTED]> > Content-Type: text/plain; format=flowed; charset=iso-8859-1; > reply-type=original > > More-or-less exactly how they taught us in the Georgia Tech Ceramic > Engineering department.... > > Ray Barkalow - First Rays Orchids - www.firstrays.com > Plants, Supplies. Books, Artwork, and lots of Free Info! > > > ----- Original Message ----- > From: "Russell M. Tyler" <[EMAIL PROTECTED]> > To: <[email protected]> > Sent: Saturday, July 21, 2007 7:58 AM > Subject: [OGD] Calcined > > >>A Google search resulted in the following: >> >> "To heat (a substance) to a high temperature but below the melting or >> fusing point, causing loss of moisture, reduction or oxidation, and the >> decomposition of carbonates and other compounds." >> >> Russ Tyler, Brainerd, MN >> _______________________________________________ >> the OrchidGuide Digest (OGD) >> [email protected] >> http://orchidguide.com/mailman/listinfo/orchids_orchidguide.com > > > > > ------------------------------ > > _______________________________________________ > the OrchidGuide Digest (OGD) > [email protected] > http://orchidguide.com/mailman/listinfo/orchids_orchidguide.com > > > End of Orchids Digest, Vol 9, Issue 232 > *************************************** > > > -- > No virus found in this incoming message. > Checked by AVG Free Edition. > Version: 7.5.476 / Virus Database: 269.10.12/910 - Release Date: > 21-07-2007 15:52 > > _______________________________________________ the OrchidGuide Digest (OGD) [email protected] http://orchidguide.com/mailman/listinfo/orchids_orchidguide.com
