-
Q Why is the fixing agent used?
A Its purpose is to remove or clear all unexposed and undeveloped silver halide crystals from the film emulsion allowing light to pass through the film image and permitting viewing of the radiographic image on a view box.
-
Q What is a fixing agent?
A Definitions of fixing agent. A chemical compound that sets or fixes something (as a dye or a photographic image) synonyms: fixer. Types: fixative. A compound (such as ethanol or formaldehyde) that fixes tissues and cells for microscopic study.
-
Q What is wetting agent in dyeing?
A Another important auxiliary used in dyeing are wetting agents. Wetting agents are basically surfactants that lower the surface tension of a liquid, allowing easier spreading, and lower the interfacial tension between two liquids.
-
Q Is detergent a good wetting agent?
A Wetting agents consist of molecules that are attracted to water on one side and to waxes on the other. Wetting agents and washing detergents work the same way. The addition of ordinary washing detergent can improve the penetration of water in soil, but the effect does not last very long.
-
Q What is wetting and dispersing agent?
A Wetting agents are surface-active substances and improve the wetting of solids. Dispersing agents prevent particles flocculating by various mechanisms (electrostatic effects, steric effects). Wetting and dispersing additives unite both mechanisms of action in one product, i.E. They are both wetting and stabilizing.
-
Q Is a wetting agent the same as a surfactant?
A All wetting agents are surfactants, but not all surfactants are wetting agents. Wetting agents are a class of surfactants that lower the interfacial tension of a liquid. An example is water. Water has a high interfacial tension, so a drop of water tends to “bead” on a hydrophobic surface, such as plastic.
-
Q What is the function of wetting agent?
A Wetting agents that lower the surface tension of a liquid, allowing easier spreading, and that lower the interfacial tension between two liquids.
-
Q Why caustic soda is used in scouring?
A Uses of caustic soda: scouring, is a chemical washing process used to remove unwanted materials from the cotton fabric. In this process, the fabric is boiled in an alkaline solution made up of caustic soda.
-
Q Why is desizing essential before scouring and bleaching?
A The continuous desizing, scouring and bleaching process allows to remove the size, to degrade the waxes and natural fats which are contained in the natural cotton (scouring or alkaline boiling), and to oxidize the chromophores molecules.
-
Q What is desizing and scouring?
A Desizing removes the size applied to warp yarns prior to weaving; scouring breaks down pectins and waxes and helps remove other impurities present in cotton fibres to improve water absorptivity; and bleaching commonly done with hydrogen peroxide under near boiling temperature, removes coloured impurities from fabrics .
