Your assertion that the "gold" rises to the highest is The rationale I ask this since that's the way mica particles act in the pan. The sampling should really contain sitting on the mountainside and really seeing what's throughout you. Occasionally the 'lay from the land' can provide clues as https://simbadirectory.com/listings13264159/gold-standard-100-whey-protein-for-sale-things-to-know-before-you-buy