Today our bathrooms were grouted. The shower floor and the master bath floor use the same color grout but due to grout size differences one is sanded (shower) and the other is unsanded. Both are pewter from Polyblend. The unsanded grout turns out to be exactly what I expected (gray) but the sanded grout is turning blue and remains much darker. It's been only 5 hours so I know it can still change but I is the blue color normal? Thanks.