M. G. Devour wrote:

> If I understand correctly, you use the hach reagents to digest and
> mark the silver, then read the absorption on the spec. This is at a
> fixed set of wavelengths, one wavelength, ... or what? Essentially
> colorimitry?

Yes that is what it is.  They do not digest though, you have to do that
first (if needed).

Marshall


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