One half of the lead thus obtained is put into a dry cupel of bone ash, and placed in the cupelling furnace, and treated as described in the article on assaying; the metallic button left on the cupel is then detached and weighed.
By dissolving it in boiling water, and slowly evaporating the solution, crystals may be obtained.
They are distinguished from true coals by burning with little flame and much smoke.
If it be required to purify any carbonaceous matter, to render it fitter for delicate pigments, this may be done by first calcining it in a close vessel, and then lixiviating it in water slightly acidulated by nitric acid.
This colour ought to be green, and be preserved in a close vessel.
The earthy and stony matters that accompany the ore are scorified by this fusion, just as they are by the other which is performed in a close vessel.
When these are dried, they are brought to a state of ignition between coals, and then suffered to cool; after which they are preserved from the air and moisture in a close vessel.
Pliny also mentions another circumstance in regard to the burning of the Egyptian nitrum; namely, that it must be done in a close vessel, otherwise it would decrepitate or fly off.
The above list will hopefully provide you with a few useful examples demonstrating the appropriate usage of "close vessel" in a variety of sentences. We hope that you will now be able to make sentences using this group of words.
