To make a big hole in a wall, we’ve placed 150x150mm timber posts through the wall at first floor level. These are supported on one end by acro-props (which fly through the floor), and on the end by brick stacks on a board, which are held by glulam timber joists (themselves propped up by acro-props). An engineering wonder!
So, the old contractors (God bless em) left £100’s worth of mortar out in the rain. When I went to the manufacturer to get some more, I was told that they had run out and were not making it anymore. The search for a new mortar which was the same colour then began. The problem is, you can’t tell what colour it is until 4-6 days later when it has dried. Hence, I had to make up rather a large number of samples. The final recipe was 45gms of black and brown dye to 25kgs of 3xno.21 type lime mortar.