Fun fact... way back when I was at school my late father was the sales & marketing manager for a major brick company so I got to learn lots about bric ...

Hello @abhijeet86 I'm glad you got excellent advice from @Adam_W, I was a bit worried that the patch on your brick looked like a form of mould. It's ...

Hi @abhijeet86 I think you will find they are actually part of the brickwork itself. When they are being kiln-fired various things in the bricks can m ...