Sodium Metabisulfite
potassium metabisulfite will work also.
Pay close attention how you spell bisulfite, and also how they company selling it spells it.
("Potassium Meta Bisolfite" is misspelled).
(Sodium bisulfate or potassium bisulfate is a different chemical that will not work to precipitate gold).
Spelling of chemical names is very important in determining what the chemical is, many chemicals may also use several names or the name of chemicals have changed over time, even different country may have a little different spelling for the same chemical.
