Meaning and Purpose
3.1 the color of the solvent properties vary with its intended application, the importance of the amount of color can tolerate depends on the material of the color feature. In today’s market sale paint, lacquer and varnish solvent or thinner, usually with little or no color. Whether there is any color this material, and the results show that the solvents of refining degree or processing of the purity of the transport or storage containers, or both.

(A) this is the guide of platinum cobalt D365 color number 10.

3.2 For many years, the term “water white” was considered adequate as a measure of solvent color. As several expressions emerged to define “water white,” it became clear that more precise color standards were needed. This was achieved in 1952 by adopting the test method D1209 using a platinum and cobalt scale. The test method is similar to that described in Standard Method 4 for water and wastewater inspection and is referred to by many as “APHA color”. The preparation of platinum cobalt color standard was originally by a. Hazen in the journal of the American chemical description of 5, he in the American journal of chemistry midterm will be 5 Numbers 5 (one over ten thousand) assigned to his platinum cobalt inventory solution. Subsequently, in the first edition (1905) of the Standard Methods for the Examination of Water, the American Public Health Association assigned the color name 500 (parts per million) using exactly the same concentration of reagents, which was the same ratio. The nomenclature of parts per million is not used because the color does not refer directly to the weight relationship. Therefore, it is recommended not to use the incorrect term “Hazen Color”. In addition, because it is mainly refers to the water, so the term “APHA color” is not an option. The recommended color nomenclature for organic liquids is “Platinum Cobalt color, Test method D1209”.

3.3 The petroleum industry uses Saybolt colorimeter test method D156 to measure and define the color of hydrocarbon solvents; However, such color measurement systems are not commonly used outside the petroleum industry. According to various sources, + 25 Saybolt 25 in the color of platinum cobalt system, or the equivalent of dissolved in potassium dichromate in a 1 l distilled water to produce the color of the range between 4.8 to 5.6 mg. As the comparison of several kinds of spectral characteristics of different color system, measure and subjective way is different, so it is difficult to obtain accurate equivalence.

ASTM D1209-2019 “Determination of Chrominance of Colorless Transparent Liquids (Platinum and Cobalt Scale)”

Scope of
1.1 This test method describes a procedure for visually measuring the color of essentially light liquids (Note 1). It is only applicable to materials where the body producing the color has almost the same light absorption characteristics as the platinum and cobalt color standard used.

Note 1: The procedure used to estimate the darker liquid color of a soluble nitrocellulose base solution is given in guide D365.

1.2 In order to determine whether the observed or calculated values using this test method conform to the relevant specification, the test results shall be the “closer unit” in the last right-hand digit used when indicating the specification limits according to the rounding method of practice E29.

1.3 value to SI units shall be deemed to be standard. Other units of measurement are not included in this standard.

ASTM D1209-2019 “Determination of Chrominance of Colorless Transparent Liquids (Platinum and Cobalt Scale)”

1.4 Refer to the Material Safety Data Sheet for specific hazard information.

1.5 this standard is not intended to solve is related to its use of all safety issues (if any). It is the responsibility of the user of this standard to establish appropriate safety, health and environmental practices and to determine the applicability of regulatory restrictions prior to use. See Section 6 for a specific description of the dangers.

1.6 This international Standard has been developed in accordance with the internationally recognized standardization principles established in the Decision on Principles for the Development of International Standards, Guidelines and Recommendations issued by the Committee on Technical Barriers to Trade of the World Trade Organization.