When drawing up, the capillary chambers in the feed fill completely with ink; pushing out a few drops afterwards creates space so that these chambers can again perform their function (pressure equalisation when flying or with temperature changes) — this prevents blots and leaks and so protects clothing and paper above all. When dipping it is enough for the nib to stand fully in the ink; some collectors dip the grip section a little way in to keep the piston from drawing too much air — that is safer but requires wiping afterwards. It is important to operate the piston slowly so that the ink level reaches as high as possible.