ASTM Color Scale. ASTM Color as specified in ASTM D is a single number colour scale for grading petroleum products. The scale is defined by. 16 glass. The visual Saybolt and ASTM D Color scales can be used individually or in tandem to rank low and high chroma petroleum-based. ASTM D is a single number, one dimensional, colour scale ranging from a pale straw through to a deep red in sixteen steps ( – units in increments of .
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Color discs situated on either side of the sample astn standards conforming to the chromaticity coordinates of ASTM D Rotate the discs by turning dials on the front of the comparator until the sample color matches the color standards and take the reading directly from the dials.
Two-disc configuration offers a distinct advantage over single-disc systems – the sample is always bracketed between the next lower and higher color standards allowing the viewer to easily determine the actual sample color.
Comparator may also be used to quickly determine if a sample falls between two predetermined color limits. View the sample from either a standing or sitting position through a prism eyepiece that brings the standards and sample together in a three-field comparison. A detachable prism light shield may be inserted to eliminate any outside light interference.
Koehler K / K Bench-top Colorimeter (ASTM D, D) | Labequip
Color corrected filtered halogen light source corresponding to Illuminant C of the CIE system provides clear visibility, assuring accurate readings. The following link provides additional information from the instruction manual or original manufacturer’s brochure.
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ASTM D – 12() Standard Test Method for ASTM Color of Petroleum Products (ASTM Color Scale)
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