Understanding the Gardner Color Scale
Developed in 1958 the Gardner Color scale is a 1 to 18 point scale to describe the yellowness of transparent liquids. A color score of Gardner 1 is a light yellow and a color score of Garner 18 is a dark brown. The standard was originally developed to measure the resins. fatty acids, varnishes. and drying oils and was defined by a set of liquid color standards. The ASTM Standard D1544 uses glass filters, in lieu of the liquid samples, to correlate visual yellowness to a repeatable standard. The ASTM standard D6045 defines the correlation to the visual Gardner Color scale.
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