COLOR MEASUREMENTS OF TURBID LIQUIDS
The present invention relates to a set-up and a method for measuring color of a turbid liquid giving a result matching a visual observation.
1 . A set-up for measuring a color of a turbid liquid to obtain a result matching a visual color observation comprising:
i) a housing wherein at least 50% of the inside area is white; and
ii) a light source illuminating the inside of the housing giving consistent, light conditions;
iii) a transparent sample holder placed inside the housing positioned against the optical fiber connected to the entrance slit of the detector of a spectrophotometer;
iv) a colored turbid liquid to be poured into the sample holder of iii);
v) a spectrophotometer for measuring the color spectrum of the colored turbid liquid;
vi) a computer; and
vii) a spectrophotometric software which is able to collect and calculate colorimetric data.
2 . The set-up according to claim 1 , further comprising a spectrophotometer, wherein:
the light source mimics daylight;
the transparent sample holder contains a stationary, turbid liquid;
and
the colorimetric data are lightness, chroma and hue.
3 . The set-up according to claim 1 , wherein the colorimetric data are lightness, chroma and hue.
4 . The set-up according to claim 1 , wherein the light source of ii) is mimicking daylight.
5 . The set-up according to claim 1 , wherein at least 65% of the inside area of the housing is colored white.
6 . (canceled)
7 . The set-up according to claim 1 , wherein the sample holder is colorless.
8 - 11 (canceled)
12 . The set-up according to claim 1 , wherein the sample holder is removable.
13 . The set-up according to claim 1 , wherein the sample holder is the packaging of a final product.
14 . The set-up according to claim 1 , wherein the turbid liquid is a non-diluted final product.
15 . (canceled)
16 . A method for measuring the color of a turbid liquid matching a visual color observation, comprising:
i) providing a housing wherein at least 50% of the inside area is white, the housing comprising a light source; a spectrophotometer; and a transparent sample holder containing a turbid liquid sample;
ii) illuminating the turbid liquid sample with the the light source;
iii) measuring the color spectrum of the turbid liquid sample with the spectrophotometer;
iv) converting the measured color spectrum into colorimetric values using a computer and a software for doing so; and
v) providing a digital color read out corresponding to
a) a visual observation of the color of the turbid liquid or
b) the color of the turbid liquid.
17 . A method for measuring the color of a final product comprising a turbid liquid matching a visual color observation, comprising:
i) providing a housing wherein at least 50% of the inside area is white, the housing comprising a light source; a spectrophotometer; and a final product comprising a turbid liquid;
ii) illuminating the turbid liquid with the light source;
iii) measuring the color spectrum of the turbid liquid with the spectrophotometer;
iv) converting the measured color spectrum into colorimetric values using a computer and a software for doing so; and
vi) providing a digital color read out corresponding to
a) a visual observation of the color of the turbid liquid, or
b) the color of the turbid liquid.
18 . The method of claim 17 , wherein the final product is a beverage placed in transparent bottle.
19 . The method according to claim 16 for measuring the color of a turbid liquid in the form of chroma, hue and lightness matching a visual color observation: wherein the light source mimics daylight and the converting comprises
converting the measured color spectrum into spectrocolorimetric values using a computer and a software for doing so; and
the digital color read out is in the form of chroma, hue and lightness corresponding to
a) a visual observation, or
b) the color of the turbid liquid
20 . The method according to claim 16 , wherein at least 65% of the inside area of the housing is white.
21 . (canceled)
22 . The method according to claim 16 , wherein the transparent sample holder is the packaging of a final product.
23 . The method according to claim 16 , wherein the transparent sample holder is a final product.
24 . The method according to claim 16 , wherein the liquid is stationary.
25 . (canceled)
26 . The method according to claim 17 , wherein the product is selected from food products, paints, hair products, body care products and cosmetics.
27 . The method according to claim 26 , wherein the food product is selected from a dairy product, an oil product and a beverage.
28 . The method according to claim 27 , wherein the beverage is selected from fruit juice products, smoothies, soft drinks, wine and beer.
29 - 30 (canceled)