iandol on sat 16 feb 02
You say <THE TOP, even if it seems quite clear, because it will contain the very =
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.
vince pitelka on sat 16 feb 02
"You say <THE TOP, even if it seems quite clear, because it will contain the very
Does this even include the seemingly clear liquid at the top which gives no
reaction, that is backscatter, to a beam of light?"
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 -
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iandol on sun 17 feb 02
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.
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