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I bought some ‘silver sand’ a few years ago from Homebase.
i seem to remember it having all sorts of colour particles in it, some quick dark and then the regular sand colour. This might work quite nicely with a standard grey cement mix.
I personally wouldn’t want it to match too closely, i’d much prefer a contrast
I always point with 2:1:1 sharp:soft:cement. This will dry to a very light grey. Make sure you use a yellow or orange builing sand. We have red sand where i am and you can see it in the final colour of the mortar when its dry. Once it settles and weathers in that will be fine against the granite. - as good as you will get. Be aware at this time of year it can take quite a few days to dry to its final colour.
Most definitely do not go ahead and point first without experimenting and getting the go-ahead from the customer. As Ed says your standard mix may end up an acceptable shade and that would be your starting point. However, you may very well need to add some dye for the immediate effect your customer appears to want.
agreed on the dye but for silver setts you will need very little. Make up a series of gauged samples.
Afternoon Josh
have you had a look at Larsens GPM - its premixed pointing compound and the do a grey colour.
Its really good quality and pretty easy to use. The bonus is that you can assure your customer ( and yourself) that it will still be were you put it in the same colour 10 years from now.
Cheers
John
Hi, have you also looked into the sweep-in two part resin jointing compounds. Gftk vdw-855 is a heavy duty one that they do in a stone grey. Expensive but will take a very short time to do and will save costs on the labour. Have a look at their site for specs, just google gftk and jointing compounds.
Dave
I would second the use of Gftk - it will leave a textured finish similar to the granite. Yes it is expensive in comparison to the raw materials needed for a traditional pointing, but it will be :quicker, very hard wearing and if necessary you can use it in the rain.