Twaddle is also used for non-thixotropic fluids. 47% caustic soda solution has a specific gravity of 100 twaddle. This was the strength at which it was shipped out by road tanker from the chemical works where I was an apprentice.

The strangest unit I have come across was in the mid-Cheshire chemical industry. mls normal on 20 was the amount of normal* acid, in millilitres, required to titrate twenty mls of sample.

*normal acid being the gram equivalent weight per litre


DC