091508_01
Calotypes Lyrics

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Comments from YouTube:

Jason Andrescavage

2y↑2

My favorite photographic process of all. The calotypes in the V&A photo room are incredible.

Axel

2y↑1

Why does the positive copy need no more chemicas to become visible on paper while the original negative needed one more step and gallic accid before being revealed?

Axel

2y↑3

@jota serna Thank you :))

jota serna

2y↑3

Porque en la copia positiva nos tomamos el tiempo que la luz solar requiera para ennegrecer el papel, mientras que en la cámara, la acción de la luz debe ser muy breve para plantear tiempos de exposición razonables, generando una imagen latente que sólo se hará visible con el revelado: algo parecido al papel fotográfico.

Valentinius62

3y↑1

What is the difference between a calotype and an ambrotype?

MechanicalCanvas

@Valentinius62 Silvering is a main factor in Daguerreotypes. They would not be done on glass with the exception of a silvered mirror and if so, were far less common than metal. There were even professionally made stock plates that were pre-silvered and could be bought so practitioners had one less step. Wet plates, known as ambrotypes (glass) or tintypes (metal) depending on their substrate took over the popularity of Daguerreotypes when they were invented. Those you will see much more on glass as either negatives or positives when backed with dark material.

TheStockwell

3y↑1

@Valentinius62 Daguerrotypes were always created on silver-coated copper plates and could not be used as negatives. Less than 20 years after their invention, they were replaced by the wet plate/collodion process which used glass and did create negatives. The first photographs of Abraham Lincoln were daguerreotypes. Later images of him - and of the Civil War - were wet plate images made from glass negatives.

Valentinius62

3y↑1

@garge7676 His name is Bakody. Turns out he also has a YouTube channel.

https://www.youtube.com/channel/UC9PgCrB53Zc5dSOQepm4MLA/videos?view=0

garge7676

@Valentinius62 Do you know the Hungarian fellow's name? I'm interested now

Valentinius62

3y↑1

@garge7676 Ah, you are correct. I should have said collodion or ambrotype images on glass. However, daguerreotypes on glass plates I believe were experimented with and I have seen one surviving example from the early 19th century. There is also a Hungarian photographer who makes daguerreotypes directly on to a glass plate that he silvers first. I remember he talks about how difficult it was to perfect the process on glass, so since he could obviously just have done his pictures on metal, or done ambrotyping on glass, he knows the difference. Quite good work he does, too.

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