Faraday to Peter Henry Berthon   23 February 1860

Royal Institution | 23 Feby. 1860

Sir

Having analyzed the six samples of Red lead labled (as above¹) I do not find in any of them any adulteration or substance added to make weight. They are in that respect unobjectionable & appear to me to be alike in preparation and well manufactured articles - but there may be reasons for preference in relation to their use dependant upon the manner in which they are prepared of which I am not a judge.

I am Sir | Your Very faithful Servant | M. Faraday

P.H. Berthon | &c &c &c