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The hectograph, gelatin duplicator or jellygraph is a printing process that involves transfer of an original, prepared with special inks, to a pan of gelatin or a gelatin pad pulled tight on a metal frame. [1] While the original use of the technology has diminished, it has recently been revived for use in the art world.
GESTIS Substance Database is a freely accessible online information system on chemical compounds. It is maintained by the Institut für Arbeitsschutz der Deutschen Gesetzlichen Unfallversicherung (IFA, Institute for Occupational Safety and Health of the German Social Accident Insurance ).
A gelatin silver print is composed of four layers: paper base, baryta, gelatin binder, and a protective gelatin layer or overcoat. The multi-layer structure of the gelatin silver print and the sensitivity of the silver imaging salts require specialized coating equipment and fastidious manufacturing technique to produce a consistent product that ...
Ballistic gelatin is traditionally a solution of gelatin powder in water. Ballistic gelatin closely simulates the density and viscosity of human and animal muscle tissue, and is used as a standardized medium for testing the terminal performance of firearms ammunition. While ballistic gelatin does not model the tensile strength of muscles or the ...
In general, John Aitchison defined compositional data to be proportions of some whole in 1982. [1] In particular, a compositional data point (or composition for short) can be represented by a real vector with positive components. The sample space of compositional data is a simplex: = {= [,, …,] | >, =,, …,; = =}.
The Global Powder Metallurgy Database (GPMD) is an online searchable database that has been developed as the result of a joint project between leading regional powder metallurgy (PM) trade associations, the EPMA and its sister organisations in Japan and North America ().
The emulsion is usually coated onto a substrate of glass, films (of cellulose nitrate, cellulose acetate or polyester), paper, or fabric. The substrate is often flexible and known as a film base . Photographic emulsion is not a true emulsion , but a suspension of solid particles (silver halide) in a fluid (gelatin in solution).
The albumen seals the paper and creates a slightly glossy surface for the sensitizer to rest on. The paper is then dipped in a solution of silver nitrate and water which renders the surface sensitive to UV light. The paper is then dried in the absence of UV light. The dried, prepared paper is placed in a frame in direct contact under a negative.