I'm sorry but I'll have to correct you - I said 'sometimes' called connollising, because most people have no idea what it's called! But the process is called connollising.
As far as I know, Tanallising is a chemical process for treating wood, and I think you may be getting confused with Tanning - so called because the leather is stained brown with tannin. The tannin comes from doggy poo (called 'tosh' in the trade) - the person who used to rub the dung into the leather was called a tanner, the person who walked the streets collecting dog dropping was called a Tosher.
However, this has nothing to do with the process we use to colour leather. The Connolly Leather Company developed special paints for colouring leather, and only when using these paints can you say you are connollising.
Clean Image decided to switch to using these Connollising paints because the acrylic paints used by most of the smart repair companies were... crap! They would wipe off when you tried to clean or condition the seats. So we wanted to use the origional gear the same as was used at the factory.
However, now most of the leather is treated with acrylic paints at the factory, and the acrylic paints available to companies like ours are much improved. We still believe the proper Connolly paints are more hard wearing, especially on high wear areas like steering wheels, now we are using both kinds.
