Pt-Co/Hazen/APHA Colour (ASTM D) Colour Reference Standards are for routine calibration of colour measuring instruments and verification of test data. ASTM D – 05 – Download as PDF File .pdf), Text File .txt) or read online. ASTM D Standard Test Method for Color of Clear Liquids (Platinum Cobalt Scale) defines the visual APHA/Pt-Co/Hazen color scale for.

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Subsequently, in their first edition of Standard Methods for the Examination of Water, the American Public Health Association, using exactly the same concentration of reagents, assigned the color designation parts per million which is the same ratio.

ASTM D – 05() Standard Test Method for Color of Clear Liquids (Platinum-Cobalt Scale)

Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided dd1209 part of the standard. For specific hazard statements see Section 6. Historical Version s – view previous versions of standard Translated Version s: Link to Active This link will always route to the current Active version of the standard.


This was accomplished in with the adoption of Test Method D using the platinum-cobalt scale. Note 1—A procedure for estimating color of darker liquids, described for soluble nitrocellulose base solutions, is given in Guide D The property of color of a solvent varies in importance with the application for which it is intended, the amount of color that can be tolerated being dependent on the color characteristics of the material in which it is used.

The presence or absence of color in such material is an indication of the degree of refinement to which the solvent d129 been subjected or of the cleanliness of the shipping or storage container in which it is handled, or both. The parts per million nomenclature is not used since color is not referred directly to a weight relationship. Historical Version s – view previous versions of standard.

No other units of measurement are included in this standard. Because of the differences in the spectral characteristics of the several color systems being compared and the subjective manner in which the measurements are made, exact equivalencies are difficult to obtain.


The paint, varnish, and lacquer solvents, or diluents commercially available on axtm market normally have little or no color. It is applicable only to materials in which the color-producing bodies present have adtm absorption characteristics nearly identical with those of the platinum-cobalt color standards used. The petroleum industry uses the Saybolt colorimeter Test Method D for measuring and defining the color of hydrocarbon solvents; however, this system of color measurement is not commonly employed outside of the petroleum industry.

Hazen in the American Chemical Journal in which he assigned the number 5 parts per ten thousand to his platinum-cobalt stock solution.

It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.