irish_spread
Private Member
This style of pointing is called Butter Pointing and is always required by English Heritage to match in with old weathered lime joints though this was not the case here the Architect just specified it, the mix is 4 silver sand, 1 sharp, 1 white cement and one part Butter, the Butter helps soften the colour of the morter and promote the growth of moulds and moss on the wall to age it more.
I can't believe it's not butter