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The table shows how the two systems rate high-brightness papers, but there is no simple way to convert between the two systems because the test methods are so different. [4] The ISO rating is higher and can be over 100. This is because contemporary white paper incorporates fluorescent whitening agents (FWA). Because the ISO standard only ...
Whiteprint plan copy. USSR whiteprints. 70s. Whiteprint describes a document reproduction produced by using the diazo chemical process. [1] It is also known as the blue-line process since the result is blue lines on a white background. It is a contact printing process that accurately reproduces the original in size, but cannot reproduce ...
Photographic printing is the process of producing a final image on paper for viewing, using chemically sensitized paper.The paper is exposed to a photographic negative, a positive transparency (or slide), or a digital image file projected using an enlarger or digital exposure unit such as a LightJet or Minilab printer.
Polysulfide or 'direct' toners – these do not require a bleaching stage. Except for polysulfide toners, sepia toning is done in three stages. The print is first soaked in a potassium ferricyanide bleach to reconvert the metallic silver to silver halide. The print is washed to remove excess potassium ferricyanide and then immersed into a bath ...
The bromoil process is a variation on the oil print process that allows for enlargements. [2] In 1907, E. J. Wall described how it should theoretically be possible to place a negative in an enlarger to produce a larger silver bromide positive, which would then be bleached, hardened, and inked following the oil print process. [1]
Encaustic is a method of painting that involves dry pigments mixed with hot beeswax, then applied to the surface of a support such as wood or canvas. A completed painting is then finished by taking a source of heat to reheat the surface and fuse it together. Encaustic paintings do not require a varnish, are resistant to moisture, and do not yellow.
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Methods for increasing the sustainability of book and paper conservation work include the responsible sourcing of tools and repair materials (e.g. bamboo spatulas), [73] the use of less industrial chemical solvents and safer chemical alternatives, the use of fewer animal-sourced products (e.g. replacing gelatine glues with synthetic ethylene ...
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