bleaching agents to improve whiteness in minerals

EP1146089A1 - Methods for bleaching kaolin clay and other ...

Improved methods for bleaching kaolin clay and other minerals are provided. More particularly, methods of the present invention employ a hydrosulfite or bisulfite material and a second reducing agent, preferably a reducing agent that contains a Group III element, such as a borohydride, to increase the brightness of kaolin clay and other minerals and reduce color present therein.

bleaching agents to improve whiteness in minerals ...

Oct 12, 2012· Skin whitening agents are help to improve texture of skin. … essential nutrients like vitamins and minerals … aur foot,aur face ko kis tarha sa jaldi white … Tooth Whitening, Teeth Bleaching … due to changes in the mineral … fabricate custom fitted whitening trays that will greatly improve … of light-activated bleaching.

Bleaching Efficacy of Whitening Agents Activated by Xenon ...

color intensity (chroma) seems like light intensity (whiteness). This is especially true for the yellow color, which reaches its strongest saturation at high whiteness values.9 Therefore, the two attributes that define the perceived increase in brightness achieved by the bleaching procedure, are the change in white-

Method of improving the brightness of calcium carbonate ...

A method of improving the brightness of calcium carbonate filled paper. The filled paper is dried and then bleached with an aqueous solution of a bleaching agent. The process may be used on all grades of paper that contain filler and is particularly useful in the bleaching of low brightness grade papers that are produced from mechanical pulp that contain calcium carbonate.

Lecture 3: Scouring and Bleaching Flashcards | Quizlet

Start studying Lecture 3: Scouring and Bleaching. Learn vocabulary, terms, and more with flashcards, games, and other study tools. ... Improve uniformity of dyeing (remove minerals) 3 bath components for scouring. NaOH (caustic soda) Surfactant ... What are 2 measures of whiteness for NaOCl bleaching? Whiteness index want 72-80

Suitable Bleaching Agents for Talc - Hydrometallurgy ...

Robert, the bleaching/leaching would be to increase the whiteness of the talc. Currently, the talc is considered to be white or maybe "off-white" in color and my aim is to get it to "brilliant white". Now, these colors should be quantified on a scale (e.g., Hunter) but unfortunately the clients in this part of the world simply use the eye test.

Chemicals used in paper manufacturing

Pigments that absorb in the yellow and red part of the visible spectrum can be added. As the dye absorbs light, the brightness of the paper will decrease, unlike the effect of an optical-brightening agent. To increase whiteness, a combination of pigments and an optical-brightening agent are often used. The most commonly used pigments are blue and violet dyes.

Paper chemicals - Wikipedia

Paper chemicals designate a group of chemicals that are used for paper manufacturing, or modify the properties of paper.These chemicals can be used to alter the paper in many ways, including changing its color and brightness, or by increasing its strength and resistance to water.

bleaching agents to improve whiteness in minerals

Peroxide bleaching agent effects on enamel surface microhardness ... It was concluded that bleaching agents can alter the microhardness, ... For groups treated with Whiteness Perfect (10% carbamide peroxide - CP), ... enamel surface presented reduction in Knoop microhardness and increase in surface roughness. ... by bleaching oxidizing process roughened the surface, the loss of mineral...

The Little-Known Secrets about Bleached Flour...

Mar 26, 2009· It has not been determined how many mills are bleaching flour with chorine oxide, but we do know the use of chlorides for bleaching flour is considered an industry standard. The Environmental Protection Agency (EPA) defines chlorine gas as a flour-bleaching, aging and oxidizing agent that is a powerful irritant, dangerous to inhale, and lethal ...

Light-activated Bleaching: Effects on Surface Mineral ...

Comparisons The samples were treated with a 35% HP gel Whiteness HP Maxx® (FGM, Joinville, Brazil) and these were randomly allocated into four different groups (n = 10), as shown in Table 1. In the experimental groups, the bleaching agent was mixed at a rate of three drops of peroxide to one drop of thickening agent.

The effect of two remineralizing agents and natural saliva ...

In order to compensate the adverse consequences of bleaching agents, the use of fluoride-containing remineralizing agents has been suggested by many researchers. The aim of this study was to compare the effect of applying two remineralizing materials on bleached enamel hardness and …

Susceptibility of Enamel Treated with Bleaching Agents to ...

To receive news and publication updates for International Journal of Dentistry, enter your email address in the box below. ... Susceptibility of Enamel Treated with Bleaching Agents to Mineral Loss after Cariogenic Challenge. ... more changes may occur on enamel structure as the concentrations of bleaching agent increase.

bleaching process of iron ore | Solution for ore mining

Oct 12, 2012· (1) high whiteness fine crushing barite powder barite ore is crushed, washing, bleaching process … tailings thickener in iron ore beneficiation; small manganese … Mineral Ore Beneficiation Plant & Machines – Mineral Processing … Bleaching and tinting process. 13. Material handling equipment – conveyor belt, vibrator feeder …

DRY-CLEANING, WASHING OR BLEACHING FIBRES, …

material to increase the apparent reflectance in the visible region by conversion of ultra-violet radiation into visible light and so to increase the apparent brightness or whiteness Optical brighteners, optical brightening agents (OBAs), fluorescent brightening agents (FBAs) or fluorescent whitening agents (FWAs) are chemical

Teeth Whitening: Tooth Bleaching Fast Facts

Tray-based tooth bleaching systems. With this teeth whitening option, a mouth guard-like tray is filled with a peroxide-based bleaching gel or paste and placed over the teeth for one to several ...

THE BLEACHING CLAYS - USGS

kaolin minerals appear to be the product of extreme weathering of kinds of i_gneous rocks and are highly stable. The bleaching clays appear to be composed chiefly of the less and less completely weathered clay minerals. They are characterize by high contents of …

BLEACHING TECHNIQUES IN RESTORATIVE DENTISTRY | …

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US7648032B2 - Effective reductive bleaching of mineral ...

Disclosed herein are a method of reductively bleaching a mineral slurry comprising adding in the mineral slurry an effective amount of a formamidine sulfinic acid (FAS) and an effective amount of a borohydride to reductively bleach the mineral slurry, compositions comprising a mineral slurry, a FAS, and a borohydride, and final products comprising a mineral obtained by the method disclosed herein.

12 Herbal Remedies To Lighten Dark Butt! - Boldsky.com

Sep 30, 2016· Hydrate your skin with ample amount of water. Eat food rich in fibre, vitamins and minerals to improve collagen level in the skin, which in turn will improve elasticity. ... Citric acid in lemon juice acts as a natural bleaching agent. ... Natural humectant, antioxidants and antiseptic properties in this homemade mask for white butt works to ...

Textiles - Chp. 12 Flashcards | Quizlet

Process in which the articles being cleaned are immersed in an organic solvent cleansing fluid and tumbled in a machine like at home-Organic solvents are used in dry cleaning (VERY effective: cleaning soils of oily nature (gravy, oily perspiration, hair products, etc)) (NOT VERY effective: water-based soils (salt, sugar, fruit stains, etc)

Effects of experimental bleaching agents on the mineral ...

enamel,14 fluoride has been added to bleaching agents to minimize the effects of bleaching on enamel.7,15,16 It is believed that high concentrations of fluoride and calcium added to the bleaching agents will control mineral loss, even if the agent has low pH, in view of the fact that the bleaching will be saturated with ions.15,16

Effects of experimental bleaching agents on the mineral ...

Effects of experimental bleaching agents on the mineral content of sound and demineralized enamels ... with Whiteness HP Maxx or White Class presented lower microhardness values than did the ...

Bleaching Effects on Color, Chemical, and Mechanical ...

Clinical Relevance Bleaching initial enamel caries lesions with 10% carbamide peroxide can camouflage white spot lesions without affecting the chemical and mechanical properties of the enamel. Appl...

Effect of tooth-bleaching agents on phosphate ...

When the bleaching agent causes enamel de-mineralization, ionic changes are activated which increase mineral uptake, replacing thus mineral loss caused by bleaching agents.25, 26 Nevertheless, in the present study the variable «saliva» was eliminated in order to concentrate on the real effect of bleaching gels on the concentration of ...

Tooth whitening - Wikipedia

Tooth whitening under this condition could irritate the pulp or cause it to become sensitive. Younger people are also more susceptible to abusing bleaching. Persons with visible white fillings or crowns. Tooth whitening does not change the color of fillings and other restorative materials.

Skin whitening - Wikipedia

Skin whitening, also known as skin lightening and skin bleaching, refer to the practice of using chemical substances in an attempt to lighten the skin or provide an even skin color by reducing the melanin concentration in the skin. Several chemicals have been shown to be effective in skin whitening, while some have proven to be toxic or have questionable safety profiles.

How Minerals and Oxidizers Affect Your Hair and Skin

How Minerals and Oxidizers Affect Your Hair and Skin ... Peroxide: A compound (H2O2) that is used as an oxidizing and bleaching agent to remove color pigment from the hair, which leaves a blond/white appearance. The more concentrated the peroxide, the greater the oxidizing effect.