5 Charing Cross
14th Mar: 1843
Sir
After several applications to the parties whom I expected to supply me with “pure zinc” I find they are not quite satisfied they have obtained it quite free from arsenic & antimony and therefore pause before they dispose of any zinc, as being absolutely pure, therefore, for the present, I cannot supply your order for 3 or 4 lbs of the article
I remain Sir
Your Obt Servt
Francis Watkins
H. F. Talbot Esq –