ALTANA LCS III - Manual (Page 50)

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Standard Operations
5.5.13 The ADMI color number
The ADMI color number is used to measure the color of water and
wastewater having color characteristics significantly different from
platinum-cobalt standards, as well as to those similar in hue to the
standards.
The American Dye Manufacturers Institute (ADMI) has adopted the
Platinum-Cobalt standard of the American Public Health
Association (APHA) as the standard for color value. Although this
standard is yellow, the ADMI method works for all hues.
The measurements can be carried out with 10 mm,11 mm or 50 mm
cuvette/sample cell path lengths. A longer path length increases the
degree of accuracy associated with the measurements (50 mm
path length is recommended).
Turbid samples must be filtered prior to analysis.