Dear Ahmed,
There are many different scales which may be used for the measurement of colour in grape concentrates. They include:-
- International Fruit Juice Union (IFU) Colour.
- ASBC Colour.
- EBC Colour.
- AOAC.
- European Pharmacopoeia (EP) Colour.
You will need to decide upon the scale you wish to use and measure accordingly.
Kind regards,
Ade Kujore
Marketing
Cecil Instruments Limited
Milton Technical Centre, Cambridge CB24 6AZ
United Kingdom
email:- [email protected]
telephone:- +44 (0) 1223 420821
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web site:- www.cecilinstruments.com
Mostly food color are measured by tristimulus colorimeter where you can measure L, a and b values which represent color of the juice/meat/any colored food samples. Even you can calculate the color difference after processing. Your case, the lightness values and a values will show significant changes.
If you measure colour with a spectrophotometer you can use Lambert-Beer's law for calculating the absorbance at the real concentration.
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