Ivory grout turned white!
I very carefully selected an ivory grout that matched my tub. The installer used Grout Shield, a product that is a mix-in sealer by Miracle Sealants Company sold at Home Depot.
The grout dried white. We've tried the grout efflorescence remover and it is still white. Has anyone found a stone enhancer with a yellowing effect? It think this is our best hope.