Colour cosmetics

Personal care products Leave-on rinse-off cosmetics toiletries Colour cosmetics, hair care, baby infant care Skin creams / lotions, wet-wipes, sun-care Bath shower gels, hand body wash, soaps... 

In this chapter, the creation of suspoemulsions using three different formulation, namely paints, sunscreens/colour cosmetics and agrochemicals, will be described. 

The formulation of suspoemulsions for sunscreens and colour cosmetics remains a challenge for the chemist due to the complex interactions between the particles and droplets that may result in heteroflocculation [4]. One of the main challenges here is to ensure that the small submicron particles remain individually dispersed in the formulation in order to achieve maximum UV protection for sunscreens and optimum colour properties for make-up products. To achieve maximum dispersion... 

When colour cosmetic pigments are added to O/W or W/O emulsions, the resulting system is referred to as a suspoemulsion. The particles can be in either the internal or external phases, or both, as illustrated in Figure 11.12. An understanding of competitive interactions is also important when optimising the formulation stability and performance of these materials. 

Polluted with Counterfeit Colours Cosmetic Theater... 

POLLUTED WITH COUNTERFEIT COLOURS COSMETIC THEATER... 

The main function of colour cosmetics, such as foundation, blushers, mascara, eyeliner, eyeshadow, lip colour and nail enamel, is to improve appearance, impart colour, even out skin tones, hide imperfections and produce some protection. Several types of formulations are produced, ranging from aqueous and non-aqueous suspensions to oil-in-water and water-in-oil emulsions and powders (pressed or loose). 

Ohno et al. (1996) developed a reversed-phase TLC on octadecylsilica (Cig) gel method that complementarily employs four solvent systems to separate 45 water-soluble dyes, most of which are used for colouring cosmetics or food in Japan. They applied that method in combination with scanning densitometry to separate and identify dyes in a cosmetic lotion, a bath preparation, and imported candies. Another reversed-phase TLC-scanning densitometry method, which involves two developing solvent systems, has been used by Ohno et al. (2003) to separate and identify 11 oil-soluble cosmetic dyes. That method was applied to the separation and identification of colouring agents present in two kinds of nail polishes and other cosmetic products. 

T artrazine, 4,5-dihydro-5 -oxo-1 -(4-sulfophenyl)-4-[(4-sulfophenyl)azo]-1// -pyrazole-3-carboxylic acid trisodium salt was discovered by Ziegler in 1884 and is used as a dye for wool and silk. It is used as a colour additive in foods, drugs and cosmetics, and is an adsorption-elution indicator for chloride estimations in biochemistry (B-76MI40404). 

Combes, R.D. and Haveland-Smith, R.B., A review of the genotoxicity of food, drug and cosmetic colours and other azo, triphenyhnethane and xanthene dyes, Mutation Res., 98, 101, 1982. 

Ensure that the product cosmetics are maintained through its hfe. High-performance coatings or body colour can ensure that the product does not become scuffed, chipped or visually impaired before the end of life. 

The Library of Chemical Information is maintained by the US Food and Drug Administration s Center for Food Safety and Applied Nutrition and is an excellent database for multiple classes of chemicals including food additives, cosmetics, colour additives, pesticides and other chemicals. 

Pearlescent pigments give rise to a white pearl effect often accompanied by a coloured iridescence. The most important pearlescent pigments consist of thin platelets of mica coated with titanium dioxide which partly reflect and partly transmit incident light. Simultaneous reflection from many layers of oriented platelets creates the sense of depth which is characteristic of pearlescent lustre and, where the particles are of an appropriate thickness, colours are produced by interference phenomena. Pearlescent pigments are used in automotive finishes, plastics and cosmetics. 

Vicki Barwick obtained a first degree in Chemistry from the University of Nottingham. She then joined the Laboratory of the Government Chemist (which became LGC in 1996) as an analyst in the Consumer Safety Group. Vicki was involved with a number of projects to assess the safety of consumer products, including developing test methods for the identification of colourants in cosmetics and the quantitation of phthalate plasticizers in child-care items. 

DFG-Farbstoffkommission (Dyestuff Commission) / Ringbuch - Kosmetische Farbemittel, Colours for Cosmetics (1991), C-Rot 12. 

Several amino compounds are being used extensively in industrial processes. Most of these compounds are manufactured, except hydrazine. Azo dyes are produced by diazotization of aromatic amines and currently there are at least 3000 azo dyes in use. These dyes are used widely in textiles, leather, printing, paper making, drug and food industries. In the past three decades many food, drug and cosmetic colours have been banned from commercial use as food colourants. This section gives a brief account of adverse affects caused by the use of various amino compounds. 

Another early use of iron oxides was as a cosmetic. The cosmetic boxes (cockleshells) found in the Royal Cemetery in the ancient Sumerian city of Ur contained a range of different colours. XRD analysis by the Research Department of the British Museum showed that the principal components of the red and yellow colours were hematite and goethite, respectively (Bimson, 1980). One box also contained a purple powder consisting of a mixture of quartz grains and large crystals of hematite. 

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