Calibration for baking contrast units

A method of calibrating a spectrophotometer for measuring baking contrast units (BCUs), comprising:

• transmitting a range of broadband light through a sample reflection pathway in the spectrophotometer;
• detecting, with a detector, a reference sample value based on a reflection through the sample reflection pathway of the range of the broadband light off a BCU reference standard;
• calculating, with processing circuitry, a reflectance ratio value based on a ratio of the reference sample value and a reference reflectance value;
• and
• calibrating, with the processing circuitry, the spectrophotometer for measuring BCUs based on the reflectance ratio value and a known BCU value for the BCU reference standard.

A spectrophotometer, comprising:

• a detector configured to detect a reference sample value based on a reflection of a range of light off a baking contrast unit (BCU) reference standard;
• and
• processing circuitry configured to:
• calculate a reflectance ratio value based on a ratio of the reference sample value and a reference reflectance value;
• and
• calibrate the spectrophotometer for measuring BCUs based on the reflectance ratio value and a known BCU value for the BCU reference standard.