Can I use Mapei Keracolor S Sanded Grout on Glass Mosaic tile

[kezug]

I have the following backsplash tile that is mostly glass with some stone tile intermixed. The lightest tile is the stone and the surface is smooth for all tiles pieces.

Can I use Mapei Keracolor S Sanded Grout on this type of tile? (or will it scratch the glass?)

The grout lines are 1/8".

[cwilde72]

Best to do a test board with some leftover tile. Some glass will scratch while others won't. Better to find out on scraps rather then on installed tile.

[jwmezzanotte]

what chad said. mix some and test it.
I prefer sanded grout, so if it doesn't scratch that's what I go with