I don't follow youtube links during work hours as a personal policy but an India government webpage outlines the water test for whole tumeric: https://eatrightindia.gov.in/dart/

> Test 14 : Detection of lead chromate in turmeric whole > Testing Method: > * Add small quantity of turmeric whole in a transparent glass of water. > * Pure turmeric will not leave any colour. > * Adulterated turmeric appears to be bright in colour and leaves colour immediately in water.