The traditional way to point this type of brickwork is to rake out the joints to a depth of at least 25mm (1 inch), you can use a small cold chisel for this or an angle grinder but the mess caused with an angle grinder has to be consisered as someone will have to clean up. The best mix for the pointing is a 6:1:1 mortar (6 sand : 1 hydrated lime : 1 portland cement) if you want it the normal grey colour but if you want to have coloured pointing use a 4:1 (4 sand :1 portland cement) plus the colour. All the mortar colours act as a plasticiser so there is no need for the lime or fairy liquid. Fairy liquid was banned in the 1960s as a plasticiser.
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