Why are the new tyres so shiny?

…And does that make them slippery? 

TyresToday's F1 cars are running 18-inch wheels (up from 13 inches in recent years) with the widths unchanged - 305mm... There's more... are made by PirelliPirelli is the exclusive supplier of tyres to Formula 1 having secured the contract in 2011. The range consists of... There's more... exclusively for F1F1 is the pinnacle of open wheel,  single seater car racing and arguably the highest level of any motorsport globally.... There's more.... The tyres are formed in a mould that has a chrome finish to help release the tyre, a process that produces a super-smooth, glossy, finish. 

The shine is superficial and is scrubbed off by the time the car has travelled the length of the pit laneThe Pit lane is a 3.5m wide access lane that runs parallel to the race track that the cars use... There's more... so there is no risk of slipping or sliding.