Sekonic SR-2300 Manual page 60

OMR glossary
(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)
660
570
530
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 notifies
user of the error.
PCS (printed contrast signal)
Refers to the reflectance ratio (contrast) of printed marks, symbols, and letters as
opposed to reflectance 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.
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Color
Sepia Abundant dropout colors
Magenta
Purple Some ballpoint pens cannot be used.
Brown
Bluish tones
Greenish tones
Rose For red end colors only,
Pink rose aniline, purplish red, deep red
Regular ballpoint pens can be used.
Red
Orange
Yellow As in fax scanners, it's difficult
to see with human eyes
Regular ballpoint pens can be used.
Blue Regular ballpoint pens can be used for
Green blue-end colors only. Green
White reflectance - black reflectance
White reflectance
Remarks
^
should be avoided.