iandol on sat 16 feb 02
Dear Vince,
You say <THE TOP, even if it seems quite clear, because it will contain the very =
finest particles.>>
Does this even include the seemingly clear liquid at the top which gives =
no reaction, that is backscatter, to a beam of light?
By the way, great set of instructuions.
Best regards,
Ivor Lewis.
vince pitelka on sat 16 feb 02
Ivor wrote:
"You say <THE TOP, even if it seems quite clear, because it will contain the very
finest particles.>>
Does this even include the seemingly clear liquid at the top which gives no
reaction, that is backscatter, to a beam of light?"
Ivor -
I don't know about backscatter, but I have seen people discard the top layer
even if it is quite cloudy. To be safe, if there is a layer of clear liquid
I recommend siphoning it off with the sig to make sure that the smallest
particles are not lost. It takes a little longer to concentrate, but that
is not much of an inconvenience.
Best wishes -
- Vince
Vince Pitelka
Appalachian Center for Crafts
Tennessee Technological University
1560 Craft Center Drive, Smithville TN 37166
Home - vpitelka@dtccom.net
615/597-5376
Work - wpitelka@tntech.edu
615/597-6801 ext. 111, fax 615/597-6803
http://www.craftcenter.tntech.edu/
iandol on sun 17 feb 02
Dear Vince,
Backscatter is the effect of a beam of light shining into a mixed fluid =
such as an aerosol or colloidal mixture. Invisible particles, that is, =
unresolved with a normal optical microscope, will give a reflection back =
in the direction of the light path. They can also cause refraction which =
changes the colour. Like smoke, it is blue when you look at the =
backscatter but you see brown or dull orange when you look through it =
towards the light.
ACS is the Clayart Listserver.
As a matter of politeness I send mail directly to my named correspondent =
and a cc to Clayart when discussing an open subject. Sometimes mail does =
not get to a recipient but this ensures they get my message. Should you =
not wish me do o so I will post directly to Clayart when I wish to =
question or make comment about your postings.
Best regards,
Ivor Lewis.
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