I need a way to measure the strength of Stormlight in a gemstone.” Raboniel didn’t press for details. “There is sand that does this,” she said. “Sand?” “It is black naturally, but turns white in the presence of Stormlight. It can, therefore, be used to measure the strength of Investiture—the more powerful the source of power nearby, the quicker the sand changes.
Is she talking about the sand from White Sand?
