Sekonic SR-3500 Operating Manual page 120

(5) Colors that can be used as dropout colors differ depending on the model,
but with some models, even regular ballpoint pen ink drops out and
cannot be used. In such cases, you need special OCR ballpoint pens
that are rarely available today. See table below for relationships between
wavelengths and colors.
Peak sensitivity
wavelength
740(nm) Sepia
Magenta
Purple
Brown
Bluish tones
Greenish tones
660 Rose
Pink
Red
Orange
570
Yellow
530 Blue
Green
a) It is important to control the PCS value to print dropout colors. (You
need to choose a printer equipped with devices that can measure PCS
values.)
b) If you want to use an abundance of colors, we recommend printing in
ink other than dropout colors as a "black frame sheet."
No feed
Refers to paper doesn't get fed during paper feeding operations.
If such an error occurs, the device assesses it as a paper feeding error, and
notifi es user of the error.
PCS (printed contrast signal)
Refers to the refl ectance ratio (contrast) of printed marks, symbols, and letters as
opposed to refl ectance of non-printed areas. The calculation formula is as follows.
PCS =
When reflectance of areas with no printing is 70%, and reflectance of printed
marks, symbols, and letters is 10%, the PCS will be 0.857.
Color
Abundant dropout colors
Some ballpoint pens cannot be used.
For red end colors only,
rose aniline, purplish red, deep red
Regular ballpoint pens can be used.
As in fax scanners, it's diffi cult
to see with human eyes
Regular ballpoint pens can be used.
Regular ballpoint pens can be used for
blue-end colors only. Green
White refl ectance - black refl ectance
White refl ectance
OMR glossary
Remarks
should be avoided.
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