Determination of colour (Tonality and Intensity) in Wine
The chromatic features of a wine are defined by two analytical parameters: tonality and intensity. Through appropriate mathematical formulas, calculating the absorbance of the wine at 420 nm, 520 nm and 620 nm, is possible to determine intensity and tonality value in wine. These two elements, which represent “the chromatic profile”, change with the evolution of wine and they show the quality and the “health” of wine.
Method
Readings of absorbance at 420 nm, 520 nm and 620 nm
Time testing: 1 minute.
Analysis sessions with multiple samples are possible up to a maximum of 16 tests for CDR WineLab®. This analysis is not available on CDR WineLab® Junior.
Sample treatment
Wine is analyzed as it is. If necessary (sparkling or fermenting wine), the sample shall be degassed using the specific ultrasonic bath (code 222062). In case of tests performed on must, the sample shall be centrifuged (code 222061) or filtered (code 300210).
Principle of the test
Readings of absorbance at 420 nm, 520 nm and 620 nm are made on wine (sample as is) pre-filled into the cuvettes. The instrument automatically calculates the tonality (according to the formula Abs 420 nm / Abs 520 nm) and the intensity (according to the formula Abs 420 nm + Abs 520 nm + Abs 620 nm). The innovative CDR method makes the standard procedure easier and faster. The special photometric technology together with the provided cuvettes, enable to reach higher optical densities compared to normal spectrophotometers obviating the problems of sample dilution.
Calibration curve
Comparative tests, carried out by Italian ISVEA laboratory, have shown an excellent correlation on the entire measure range with the reference method.
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Reagent test Kits
Measuring range
| Analyses | Measuring range | Resolution | Repeatability |
|---|---|---|---|
| Color [0-15] | 0 - 5 ABS 420 | 0.001 ABS 420 | 0.025 ABS 420 |
| Color [10-40] | 0 - 13 ABS 420 | 0.001 ABS 420 | 0.072 ABS 420 |
Analyzers for process and quality control in winemaking
CDR WineLab®
Complete analysis panel, supplied already configured
Up to 16 determinations simultaneously
Possibility of carrying out analyses of the same sample
Integrated printer
Full connections (LAN - USB - Bluetooth barcode/QR code reader)
CDR WineLab® Jr
Partial analysis panel, customisable configuration
Up to 3 determinations simultaneously
Wireless connection to external printer
USB connections