|
Colored Particles
This is part of a guide to the identification of particles seen in samples of
free particles.
This file includes transparent particles of any shape that have a predominant
color when viewed without polarizing filters. Anisotropic
particles in this category may exhibite a change in intensity or even color when
one polarizing filter is used and is rotated while observing
the particle. This change in color is called "pleochroism" and is dependent on
the compound having that property and its orientation.
Clothing Fibers and paints can be any color and should be keyed out as "Fibers"
or, in the case of paints, as spheres or agglomerates.
|
Magenta, Isotropic
These are isotropic particles that are tinted magenta.
|
Magenta, Anisotropic
These are anisotropic particles that are tinted magenta.
|
Red, Isotropic
These are isotropic particles that are
tinted red, pink, or red-orange. Resins,
blood-sucking insect frass, and garnets are
common members of
this group.
|
Red, Anisotropic
These are anisotropic particles
that are tinted red, pink, or
red-orange. Iron containing
compounds are often reddish on
the microscopic scale.
|
Brown,
Isotropic
These are isotropic
particles that are
tinted tan to dark
brown.
|
Brown,
Anisotropic
These
are
anisotropic
particles
that are
tinted
tan to
dark
brown.
|
Yellow,
Isotropic
These
are
isotropic
particles
that
are
tinted
yellow
to
yellow-orange.
Resins
and
highly
hydrated
iron
corrosion
products
are
common
members
of
this
group.
|
Yellow,
Anisotropic
These
are
anisotropic
particles
that
are
tinted
yellow
to
yellow-orange.
Iron
containing
compounds
are
often
yellowish
on
the
microscopic
scale.
|
Green,
Isotropic
These
are
isotropic
particles
that
are
tinted
green
to
yellowish-green.
|
Green,
Anisotropic
These
are
anisotropic
particles
that
are
tinted
green
to
yellowish-green.
|
Blue,
Isotropic
These
are
isotropic
particles
that
are
tinted
blue
to
bluish-green.
|
Blue,
Anisotropic
These
are
anisotropic
particles
that
are
tinted
blue
to
bluish-green.
|
Black,
Isotropic
These
are
isotropic
particles
that
are
tinted
gray
to
black.
|
Black,
Anisotropic
These
are
anisotropic
particles
that
are
tinted
gray
to
black.
|
| | | | | | | | | | | | | |
