New porcelain pavers losing their ‘finish’

[britishboy7]

we've just had a porcelain patio laid, approx 60m2, it was laid about 4 weeks ago. Been out today to give it a spray over with the garden hose and a sweep and noticed around a lot of the pavers, it looks as though the top colour/coating (I know that arent painted or coated but the only way to describe it) is wearing off or coming away? There’s no evidence of a residue but its on most of the pavers, even the few that havent been grouted yet. At first i thought it may of been grout residue but its not.

Any ideas please before I call the supplier? Just wondered if anyone had ever seen it before? Not very impressed with them at present...

 

[jeff the gasman]

Have they been sealed?

 

[harry_snotter]

That looks like a standard concrete slab with a surface covering. Porcelain is smooth all the way through.