Becquerel's investigations to practical account, in his own photo-engraving process.
For landscape purposes the calotype gave valuable results in the hands of amateurs, and it finally took its highest development in the wax-paper processes of Le Gray and Fenton; but until glass was used as a support for negative pictures, the business of the professional landscape photographer was a poor one.
In 1848, M. Niepce de St. Victor proposed the use of albumen on glass as a vehicle for sensitive effects was the introduction of collodion, which took place in 1850.
To Mr. Scott Archer of London is due the credit of the negative-collodion process, which has made photography the most important art-industry of the world.
In justice to M. le Gray, it should be added that he had previously suggested collodion as likely to be of service in photography.
In the autumn of 1851, Mr. Archer published a full description of his process, which did not differ essentially from that now practiced.