黄变试验方式如下：
Determination of natural color and yellowing at 95 C(photometrically)
95℃条件下的本色和黄变测定（用光度计做光度测定）
The natural color of approximately 40% solution of AH salt is determined immediately after its prepration and the degree of yellowing is determined after 2 hours at 95 C. the measurements are carried out by determining the absorbencies at wave length 460 and 620 nm.
40%浓度的尼龙66盐溶液的本色测定，在试样溶液调配好后立即可以测定。而黄变程度测定需要该溶液在95℃条件下保持两小时后测定。该测定是通过测定波长在460-620纳米范围内的吸收率来进行的。
Formula:
公式
APHA=1586.16 * E
黄变值=1586.16 * E
1586.16=calculation factor
1586.16=计算因数
E=difference between the absorbance at 460 and 620nm
E= 波长在460-620纳米范围内的吸收差异
Cell thickness=2.5 Cm
堆层厚度=2.5厘米
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