Do not mix stained, discoloured or insect-damaged kapas with good kapas: they spoil the good kapas too and lower the market value of the produce. Trash sticking to kapas, colour change from delayed drying, and sun-drying also lower the market value.
Pending expert review
Source
Crop Production Guide – Agriculture 2020 (Directorate of Agriculture, Tamil Nadu & Tamil Nadu Agricultural University (TNAU)), Cotton – Harvesting (note) & post harvest operations, p. 265
