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list of procedures
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Quantity33, approximate period: 1839 – today
In principle, all photographic papers could be made transparent by additional treatment with oil or wax and used as negative papers. In addition to transparency, the light sensitivity of the papers was also decisive for the quality of the positive prints. After the calotype, albumin papers or celloid papers were temporarily used as negative papers. However, the photosensitive silver bromide negative paper soon replaced the earlier paper negatives.
In most cases, collodion wet plates and gelatine dry plates can be reliably distinguished from each other on the basis of external characteristics. References to a collodion wet plate:
- Thick glass with irregular edges
- The colors (grey, cream, yellowish) are high-contrast
- The irregularly applied collodion layer is visible on the surface
- Glossy front and back
References to a gelatine drying plate:
- Thin glass cut by machine
- The shades (grey) are rather low-contrast
- Semi-matt front and glossy back
The different negative films often have similar external characteristics. However, certain properties may refer to certain film types.
Hints for celluloid film:
- In addition to grey tones, the carrier material can also have a yellowish-brown colouring.
- Possible smell of nitric acid
- Highly flammable
Hints for acetate film:
- Often labeled "Safety Film" at the margins.
- Possible smell of vinegar
- Blistering on the emulsion
Hints for color negative film:
- Multicolored negative, rather cold colors
- Matte layer side and glossy reverse side