This is a pear-shaped vessel, aludel being an Arabic word for the Latin sublimatorium described by Geber and others. It is the vessel of chemical sublimation (sublimatie – elevatio, conversio, nobilitatio, perfection.

In a work of Robertus Vallensis (De veritate et antiquitate artis in Lazarus Zetzner’s compilation Tbeatrum Cbemicum, 1602), there is an allusion to the pure Word of God being burnt to earth in the aludel, and processed seven times: this is typical of the mystical allusion always present in the true esoteric tradition.