It includes potassium chloride, which is a salt-like mineral that is naturally white or colorless, but sometimes takes on a pink or red color due to impurities such as clay.

Source: https://investingnews.com/sage-potash-corp-identifies-large-scale-high-grade-us-based-potash-resource-and-commences-trading-on-the-tsx-v-under-the-symbol-sage/

The study focused on examining the timing of potassium chloride absorption in potato fields.

Source: https://phys.org/news/2023-03-potassium-potatoes-fertilizer-crop-interactions.html