Cobble stone driveway advice

Atkathh

Morning, I’ve just started working for a customer who’s cobble stone driveway was full of moss. I’ve cleared all of that and put kiln dried sand down but originally it had the dust chippings in and so was grey in colour unlike the kiln sand! I’ve tried to put some granite dust on top of the sand but it does not stay. Can anyone give me advice on what to do please. It’s taken almost 2 weeks to get it cleaned of moss etc dried and sand down but now looks odd as some parts are grey, crow the dust others orange  from the sand. Does the sand dull down? 

bpj

You can get grey sand. Specialist retailers sell in a few shades, and Wickes have this which also claims to restrict weed / moss growth:

https://www.wickes.co.uk/Dansand-No-Weed-Block-Paving-Sand-Stone-Dust---20kg/p/131899