Faraday to Thomas Leverton Donaldson   21 April 1837

R. Institution | 21 April 1837.

My dear Sir,

I return to you the box, with the remains of the samples.

A. Portion of coating taken from the ante of the Propyleum¹. The blue produced by carbonate of copper: wax being mingled with the color.

B. Portion of coating taken from the soffits of the mutules of the Theseum². The blue is a frit or vitreous substance colored by copper. Wax is present here.

C. Portion of coating taken from the columns of the Theseum. I am doubtful about this surface. I do not find wax or a mineral color, unless it be one due to a small portion of iron. A fragrant gum appears to be present in some pieces, and a combustible substance in all - perhaps some vegetable substance has been used.

D. Portions of coating from the caissons or lacunaria of the Theseum. The blue is a copper frit or glass with wax.

E. Portions of coating from the Northern wing of the Propylea. The color a carbonate of copper - wax is present.

F. Do. Do. - (N. wing propylea) as E.

I also return you the drawing & the letter.

Ever truly yours | (signed) M: Faraday

T.L. Donaldson | &c &c