Gestetner, I think. When I first started school they had flat bed ones, in which you put the stencil on top of a sheet of plain paper and rolled an ink-covered roller over the top. Then the school got modern and got the ones where the stencil was put on a drum and you just had to crank the handle and as many copies as you liked came out. I also spent quite a few hours turning the handle!
There were also ones which used a spirit instead of ink, which was, I believe, methanol.
They used to cut the master sheet in a typewriter with the ribbon removed. Lousy stencil which most of you will remember was often so hard to read the teacher would go through the exam and tell you that question four actually said 8 pounds of cabbages at 2 shillings and 3 pence per pound and not 3 pounds of cabbages at blot shillings and 8 pence.
I thought the liquid was just plain metho with the pink or blue die powder in it.
Just found this
The output of the ditto machine had a special aroma. Students could tell when a class assignment was hot out of the machine by the strength of the odor of the pages. The smell came from the ditto machine’s duplicating fluid, a mix of methanol and isopropanol.
There were several different brands of these copying machines. I think every school had at least one. In the 1970's the Vintage Drivers' Club in Melbourne had a room in their club property, set up with about five or seven Gestetners and once a month the Newsletter Printing Team would spend an evening printing, collating and stapling the latest newsletter.
I have my shoulder to the wheel,
my nose to the grindstone,
I've put my best foot forward,
I've put my back into it,
I'm gritting my teeth,