Lecture 13&14 - Makeup Flashcards
what cosmetic products that used to be used were found toxic and what were they replaced with
lead and mercury
replaced with Titanium and Zinc oxides
what are the 7 main categories of cosmetics
decorative cosmetics
hair care
perfume
body care
sun care
oral care
skin care
how can cosmetic evidence be characteristic of a person
everyone uses different products and if make up shades/colours of products
the order of these products will be different for every one
the application method also has an affect
what is a cosmetic defined as
any substance or mixture intended to be placed in contact with various external parts of the human body…with a view exclusively or mainly to cleaning them, perfuming them, changing their appearance and/or correcting body odours and/or protecting them or keeping them in good condition
name a product that is
a) a drug but not a cosmetic
b) both a cosmetic and a drug
a) anti dandruff shampoo
d) toothpaste with fluoride
what products come under decorative cosmetics
nail varnish
foundation
blusher
lipstick
mascara
eyeshadow
what can make categorising cosmetics difficult
they can have more than one use e.g bronzer can also be used as eyeshadow
- just because they have an intended purpose doesn’t mean they are used for this purpose always
what makes decorative cosmetics good trace evidence (5)
easily transferred upon contact (two way transfers)
relatively persistent - can be hard to wash out
independent of age, gender, ethnicity
generally cover a large surface area
give investigative leads
what could decorative cosmetics be used to cover up
blemishes, tattoos, hyperpigmentation, scars
in the hierarchy of evidence, what level proposition can cosmetic traces give
activity level propositions
- so can be used to reconstruct an event
what results in an increase in probative value of cosmetic evidence (3)
the use of uncommon cosmetics or layering different combination of cosmetics
also the mixture of cosmetic with different peoples skin
the application method used - brush or sponge
are pigments or dyes more used in cosmetics
pigments
what type of pigments are used in facial cosmetics
inorganic (mineral) pigments
what type of Titanium dioxide is used for maximum opacity
pigment grade TiO2 particles = 0.25 micrometre
what type of pigments are used in lipsticks
organic (lakes) pigments
what does the particle size of a pigment determine
its properties
what type of Titanium dioxide is used for sun creams
nano TiO2 particles = less than 0.1 micrometre
what are non hiding white pigments used for in cosmetics and give some examples
used as extenders
e.g calcium carbonate
talc
china clay (kaolin)
silica
what are the most important inorganic pigments in cosmetics
titanium dioxide
iron oxide (red, yellow, black)
bismuth oxychloride
mica
zinc oxide
ultramarine -
(blue/purple/pink)
what are the most important metallic elements of cosmetics
aluminium flakes
iron oxide/TiO2 coated mica flakes
what does pearlescent mean
a subtle colour and bright white reflection giving a pearl-like appearance
what does interference/iridescent mean
light reflection and refraction with the colour changing relative to the angle of observation and illumination = rainbow-like appearance
e.g oil spill on water, CD surface, fish scales
what is goniochromism
an effect where surfaces appear to change
what determines the colour seen by iridescent and pearlescent substances
the thickness and composition of the layers that make them up
how are the majority of iridescent material made
synthetically
what are interference/iridescent pigments more commonly known as
shimmer