Finding a reliable English PDF of the "original" Kitab al-Kimya can be challenging due to the complex history of the "Jabirian Corpus". Jabir ibn Hayyan - PMC - NIH
It describes laboratory processes, the properties of substances, and the "Theory of the Balance" in nature. English PDF Availability: kitab al-kimya english pdf
Historical English translations of the Latin version (by authors like Adam McLean) are often hosted on specialized history sites like the Alchemy Website . Finding a reliable English PDF of the "original"
There are several English translations of "Kitab al-Kimya'" available, including: the properties of substances