The Snack Food Association produces many reference materials. The 6-point color chart is among these resources. As the last step in the chip quality test, the sample is assigned a value of 1-6 based on which SFA standard image to which it is most similar. This reference chart allows research teams worldwide to use a common unit in comparing chip color. On 11/9/11, the VPSL recorded the chip color and specific gravity of tubers representing approx. 80 genotypes grown.