Abstract
Adoption of the high volume instrument (HVI) classification system for the official marketing criteria for cotton coupled with the separation of color and trash into different grade components requires that ginners and producers be knowledgeable of the impact of gin equipment on color and trash. Several studies indicated that gins can increase the perceived color grade of cotton by as much as two grades and that Spotted and Light-spotted cotton could be improved to Light-spotted or White color grades. Consideration of the effect of individual equipment in a cotton gin in three recent studies indicated that the seed cotton cleaners did little to improve color but did improve trash grade. Further analysis showed that lint cleaners improved the color of cotton. In these studies, Rd (grayness or reflectance) was increased by about 4.4 units whereas +b (yellowness) was increased only about 0.5 units. Much of the improvement in color was attributable to the removal of trash from the sample. Since lint cleaners remove substantial amounts of trash, they must continue to be used to improve the color of cotton.
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