Spray gun nozzle which combines air and fluid before leaving gun. 
Intumescent
Flame or fire resistant coatings which increase in volume on heating.
https://www.youtube.com/watch?v=_Rh4C3FpJ8o
Knot Brush
Brush, round or oval in shape, i
n either one or two knots used for applying distempers and limewash or for washing down.
Knotting
A shellac based on Methylated Spirit for use over resinous to prevent tannic bleeding from knots and sap residue within hardwoods.
Leafing/Flake Aluminium Primer
Aluminium primer for hardwoods and for sealing against tannic acid- resin residue and bitumen.
Leather Roller
Leather Roller 
Used to produce a multi colour finish as Rag Rolling.
See: Specification- Broken Colour Techniques -Tools and Equipment Special Techniques.
Litmus Paper
Litmus Paper
The main use of litmus is to test whether a wetted surface or solution is acidic, as blue litmus paper turns red and red litmus paper turns blue when alkaline is present.