THE SMOOTH DARK MIXTURE YOU REFER TO IS PROBABLY JUST DYED MORTAR.
THE MORTAR MIX USED DEPENDS ON THE TYPE OF TILES ON THE ROOF.
BUT IN GENERAL TERMS;
5:1 SOFTER/MOULDED TILES.
4:1 CONCRETE/CAST TILES.
ONE PIECE OF ADDITIONAL ADVICE IS TO REMOVE, RE-BED AND POINT UP THE RIDGE TILES AS RE-POINTING ALONE IS AT BEST A TEMPORARY FIX AND AT WORST A WASTE OF TIME,ENERGY AND MONEY AS WEATHERING WILL RESULT IN THE ADDITIONAL MORTAR BECOMING DETATCHED FROM THE ORIGINAL.
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