IMPROVEMENT IN COLLODION.—J. B. HOCKIN & CO., Chemists, 289. Strand, have, by an improved mode of Iodizing, succeeded in producing a Collodion equal, they may say superior, in sensitiveness and density of Negative, to any other hitherto published; without diminishing the keeping properties and appreciation of half-tint for which their manufacture has been esteemed.
Apparatus, pure Chemicals, and all the requirements for the practice of Photography. Instruction in the Art.
THE COLLODION AND POSITIVE PAPER PROCESS. By J. B. HOCKIN. Price 1s., per Post. 1s. 2d.
Printed by Thomas Clark Shaw, of No. 10. Stonefield Street, in the Parish of St. Mary, Islington, at No. 5. New Street Square, in the Parish of St. Bride, in the City of London; and published by George Bell, of No. 186. Fleet Street, in the Parish of St. Dunstan in the West, in the City of London, Publisher, at No. 186. Fleet Street aforesaid.—Saturday, February 18. 1854.