Alta I Calculator
Date:  _____________       Observer:  ________________   

Sample Description   ____________________

Reflectance =    (sample voltage - dark voltage)                                    ALTA # ______
                            (reference voltage - dark voltage)

Dark V (mV) =
Color
λ
Reference
 Sample # _______
Trial-#1
%Reflectance
 Trial-#2
%Reflectance
Blue
 470-nm
Green
 555-nm
Yellow
 585-nm
Amber
 605-nm
Orange
 635-nm
Crimson
 660-nm
Red
 695-nm
IR 1
 880-nm
IR 2
 940-nm