INTERFERENCE PEARL COATING
Powder mica used in interference pearl coating has its
surface coated with titanium dioxide in the same way as
the powder mica used in conventional white pearl
coating. Since light is reflected by a boundary surface
between objects of different density, the reflection o
light occurs first on the titanium surface and then on the
boundary surface between titanium and mica. Therefore,
there is a phase lag between these two events o
reflection of light. When,· however, the amount o
titanium dioxide is small as in the case of powder mica
used in white pearl coating, the phase lag is almost
negligible and a nearly total reflection takes place, giving
a pearl white luster tinted by mica.
Interference mica
Titanium dioxide
3050046
Reflection by
boundary surface
(thin)
Reflection by
boundary surface
(thick)
Reflection
by surface
, Reflection by
boundary surface
Surface
Boundary
surface
3050047
Varieties of blue
Damped
Reflection by
boundary surface
Amplified
In interference pearl coating, the thickness of titanium
dioxide coating on powder mica is increased to make
the phase lag longer so that colours may be developed
by interference of light. When the coating is thin, light o
short wave length is damped and that of long wave
length is amplified. This tendency is reversed when the
coating is thick. As the coating thickness increases, the
colour changes from white to gold (yellow), red, purple,
blue and green in that order.
• Toscana black: Interference blue mica
Varieties
of blue
3050048
Varieties of red
4-6 BODY -
Main
Body
Boundary surface
(thin)
Boundary surface
(thick)
Varieties
of red
Surface
Mica
Amplified
3050050
Reflection by
boundary surface
I
Reflection by
surface
Damped
3050052
050051
Reflection by
surface
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