Pour some soft celloidin into a test tube; carefully revolve the test tube so that an even film of celloidin dries on the inside.
To overcome this, the sections might also be embedded in celloidin.
After a short time water begins to rise in the tube, having passed through the film of celloidin.
Remove the solution of gelatine from the interior of the celloidin case with a pipette.
Various grades of celloidin, thick and thin, in wide-mouthed bottles.