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Hunt, Robert in correspondent 
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1840-1849::1841::05 in date 
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From:
Sir John Herschel
To:
Robert Hunt
Date:
[21 May 1841]
Source of text:
George Eastman House, 7.17 (C: RS:HS 22.87)
Summary:

Thanks RH for his 'extensive and instructive view on the present state of photography.' Found many interesting results in experimenting with vegetable substances. Surprised by RH's discovery that bi-chromate of potash is a photographic substance; JH nearly achieved this result.

Contributor:
John Herschel Project
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