quick draw macgraw

Hi,

Few questions lads, what is fully vitrified tiles is it just posh name for ceramics.

looking at kitchen tomorrow not sure what tiles they are but would you use bal blue or green and whats the difference in cost between the two, also on bal website one says 10ltr tub the other 15kg are they the same size?

Obviously depends on tile size and spacing but on average how much grout per sqm is it roughly .25kg/sqm so i can guesstimate size of bag?

Finally probably a daft one here i can here you all laughing already but plywood seems to have one side darker than the other, are you supposed to lay particular side down for any reason.

Thanks Steve.