I think it might be a pale of grease...I have an ex WD 5 litre tin that looks very similar...
It could be paint...though what she might be doing with it is anyones guess.
These propaganda photos of plucky young women helping the war effort were frequently 'staged' for the camera...'Here Luv..Sit there and hold this brush like you are doing something'....
I always have a laugh at the blokes with the special screwdriver that they use for pointing at things (not necessarily screws) or for resting on various parts of the bike as required by the cameraman....
How did we win the war?...Surely not by pointing screwdrivers at German tanks?... ...Ian
I think if this was one of the WW2 staged propaganda shots, they would probably have asked her to cheer up, look a bit more interested in what she was doing and seem like she was doing her bit for the winning team?
It dose look like she's in an old brick factory. She has a cloth in her other hand, so perhaps she's just cleaning mud off with petrol or water in readiness for the workshop to work on the bikes. Neither bike has number plates, so I guess it's war time. Ron