Natural dyes in historical textiles from Romanian collections Romanian museums, research centers and monasteries preserve a large number of textiles from the 15th to the 20th century, representative from the historical and artistical points of view. Considering that synthetic dyes became commercially available in the last decades of the 19th century, fibres in these textiles […]
Wet Process Engineering
Different Types of Wash Off Agents
Different Types of Wash Off Agents: Caustic Soda (NaOH) Sodium hydroxide (NaOH), also known as lye and caustic soda, is an inorganic compound. It is a white solid and highly caustic metallic base and alkali of sodium which is available in pellets, flakes, granules, and as prepared solutions at different concentrations. Sodium hydroxide forms an approximately 50% (by mass) saturated solution with water. Sodium hydroxide is soluble in water, ethanol, and methanol. This alkali is deliquescent and readily absorbs moisture and carbon […]
The Dyeing Process of Disperse Dyes
The Dyeing Process of Disperse Dyes The dyeing of hydrophobic fibres like polyester fibres with disperse dyes may be considered as a process of dye transfer from liquid solvent (water) to a solid organic solvent (fibre).Disperse dyes are added to water with a surface active agent to form an aqueous dispersion. The insolubility of disperse […]