As far as mixing the colours, I do think it’s likely not a very good possibility with metal shingles. Having said that, if you are attempting to duplicate the seem of normal slate over a price range, There's a synthetic composite shingle item that may do a far better career https://local-metal-roofing-contr00099.blogaritma.com/28556906/the-basic-principles-of-metal-roofing-contractors