He introduced the use of pyrogallic acid as a developing agent, and was one of the first photographers to use paper negatives.
12.
Developing agents depend on the presence of organic materials or inorganic salts for their effectiveness, although the water deposited may also take a key role.
13.
It is unusual amongst developing agents as it works most effectively in slightly acid conditions rather than the strongly alkaline conditions required for most other developers.
14.
The probe into possible dumping of the chemical catechol, an antiseptic often used as a photographic developing agent, was prompted by complaints from a Chinese chemical firm.
15.
But as was previously reported, the Duelfer inquiry concluded that those laboratories appeared intended for use in developing agents for use in assassinations, not to inflict mass casualties.
16.
For this reason, in modern convention, Agent 1 is usually called " electron transferring agent " or ETA . Agent 2 is usually called the main developing agent.
17.
Also, the company promised to let the housing alliance " consult " in training Allstate's 15, 000-member sales force for three years, testing and developing agents'abilities in meeting the needs of minority clients.
18.
This also explains why ascorbate developers have poor keeping properties, as oxidised ascorbate is both ineffective as a developing agent and lowers the pH of the solution, making the remaining developing agents less active.
19.
This also explains why ascorbate developers have poor keeping properties, as oxidised ascorbate is both ineffective as a developing agent and lowers the pH of the solution, making the remaining developing agents less active.
20.
In the early days of photography, a wide range of developing agents were used, including chlorohydroquinone, ferrous oxalate, : 131 hydroxylamine, ferrous lactate, ferrous citrate, Eikonogen, atchecin, antipyrin, acetanilid and Amidol ( which unusually required mildly acidic conditions ).
