It is an urban myth to think that you can age sandstone by using milk or yoghurt.
Whether it be coursed stone, from the Sydney basin or even basalt blocks, it doesn’t work.
All it does is promote the growth of lichen at a later date. I have been asked many times the most important thing about building stone walls or stone houses.
My answer is that one block covers two. Whether it be dry pack, random rubble or coursed restoration work. Oh, and if you do want to age stone – for example in insurance restoration work – just give me a ring.
It is also of extreme importance to use the correct mortar mixes for stone laying especially if using Sydney sandstone or on any sandstone restoration work. In the majority of cases very little cement is required. With the emphasis on lime- particularly for tuck pointing and repointing.