pure liquids or solvents such as for example water aqueous solutions in particular saturated salt solutions and or colloidal solutions sols or gels ionic liquids salt liquid at room temperature and or molten salt further exemplary fluids can be selected from organic liquids in particular alcohols polyols silicones silicone oils as well as any liquid polymers or polymer solutions mineral oils and or gases and their mixtures fluid 40 is advantageously selected such that no chemical reaction takes place between introduced solid bodies 50 with one another or with the fluid or any substances that may be additionally dissolved therein an advantage of this selection consists in the fact that the fluid introduced in the glass container remains transparent and does not become discoloured even with lengthy exposure to light furthermore fine structures for example ground surfaces or polished faces or facets formed on solid body 50 are not changed by the selection of fluid 40 taking place as described a toroidal ring 22 in abutting region 12 between openings 11 and 20 corresponding to one another advantageously confers greater stability on the connection between tapered tube 1 and rod tube 2 than would be able to be obtained without this toroidal ring 22 finished glass container 125 has on one side at its u2014 when in use u2014 lower bulbous end a.