Jacob Herbert to Faraday   16 May 1850

Trinity House, | 16th May 1850.

My dear Sir,

The Committee for Lights having reason to suppose that the White Lead supplied for the Corporation’s Service of which the accompanying quantity is a Sample is not of a pure quality - They request you will favor them by testing the same, and reporting the result, together with your opinion of the nature of the Ingredients, if any, which have been mix’d therewith, and the relative proportions thereof, and of the pure Lead¹.-

I remain, | My dear Sir, | your’s very faithfully, | J. Herbert

M. Faraday Esqre | &c &c &c