Search results
Results from the WOW.Com Content Network
The thickness (concentration) of shellac is measured by the unit "pound cut", referring to the amount (in pounds) of shellac flakes dissolved in a gallon of denatured alcohol. For example: a 1-lb. cut of shellac is the strength obtained by dissolving one pound of shellac flakes in a gallon of alcohol (equivalent to 120 grams per litre). [14]
Resinous glaze is an alcohol-based solution of various types of food-grade shellac.The shellac is derived from the raw material sticklac, which is a resin scraped from the branches of trees left from when the small insect, Kerria lacca (also known as Laccifer lacca), creates a hard, waterproof cocoon. [1]
Processed shellac flakes from lac insect resin. India exported significant amounts of sticklac derivatives, especially lac dye, from the 1700s to the late 1800s. Production declined as synthetic dyes emerged, and after the late 1940s, production of seedlac and shellac also declined due to replacement.
Oleoresins are naturally-occurring mixtures of an oil and a resin; they can be extracted from various plants. Other resinous products in their natural condition are a mix with gum or mucilaginous substances and known as gum resins. Several natural resins are used as ingredients in perfumes, e.g., balsams of Peru and tolu, elemi, styrax, and ...
After the dye washing of the wastewater from the shellac cleaning, the pH value of the solution is adjusted to 4.0-4.5 with dilute hydrochloric acid. The supernatant is taken for filtration after standing for 4 hours, the pH of the filtrate is adjusted to 5.5-6.0 with a dilute alkaline solution, then a saturated calcium chloride solution is ...
In India, the insect lac or shellac was used since ancient times. Shellac is the secretion of the lac bug ( Tachardia lacca Kerr. or Laccifer lacca ). It is used for wood finish, lacquerware, skin cosmetic, ornaments, dye for textiles, production of different grades of shellac for surface coating. [ 46 ]
French polishing a table. French polishing is a wood finishing technique that results in a very high gloss surface, with a deep colour and chatoyancy.French polishing consists of applying many thin coats of shellac dissolved in denatured alcohol using a rubbing pad lubricated with one of a variety of oils.
Pyrotechnic compositions are usually homogenized mixtures of small particles of fuels and oxidizers. The particles can be grains or flakes. Generally, the higher the surface area of the particles, the higher the reaction rate and burning speed. For some purposes, binders are used to turn the powder into a solid material.