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What is dry point painting?
Not sure what you mean.. Dry point is a form of printing where you scratch into a metal ( or plastic) plate, cover with ink and then print.Never heard of Dry Point painting
French inventor of an early photographic process in 1839?
Louis Daguerre introduced daguerreotypes in 1839.
What is an early photographic process using silver plate developed in mercury vapour?
Daguerreotype
What is the difference between a wet plate camera and a dry plate camera?
A plate camera exposes to focussed light a glass plate coated with a solution of silver salts. In the early days the formula for the solution was such that the coating had to be fresh - not necessarily actually wet (which would have run and made some weird effects) but absolutely new. Fox-Talbot and his emulators travelled with a darkroom tent and coated their plates on site. Once the chemical process had been refined, it became possible to coat plates at home and take them out in a light-proof box because the coating remained active for much longer - days instead of minutes. celluloid film came much later. People who need immense detail in their pictures still use glass plates, but wet plates, unless somebody wants to try the process for fun, are long gone. The statement about the wet plate process is not accurate. I am a modern wet plate artist. The process is called WET PLATE COLLODION because the Collodion HAS TO STAY WET for the proces to work,if it's not wet, it looses sensitivity and will not produce an image. Regards, Quinn Jacobson www.wetplate.com
Who was the french inventor of an early photographic process in 1730's?
Nicephore Niepce is credited with inventing the photographic process, but not until 1825 after a few years of trying. The 18th century as you asked, is too early.
