Faraday to T. Harrison   25 March 1821¹

Royal Institution | March 25. 1821

Sir

I have examined the Vinegar very carefully and cannot find any adulteration from mineral acids in it[.] It contains a very small quantity of muriatic and sulphuric salts but not more than the purest vinegar nor more than is contained in common water[.]

I am Sir | Your Obedient Humble Servant | M. Faraday

T. Harrison Esq.