This can be attributed to the high staining effect of the colouring ingredients of tea, which has been verified in previous studies [34,35]. In this research, the colour change in the tea-stained specimens was analyzed by assessing the colour parameters, which showed a decrease in the L ...
In short, according to these previously published data, the striation is caused exclusively by the number and size of the crystals. Conversely, our XANES and SEM/TEM analysis reveal that the nature of the colouring crystals is different in the red (Cu0) and orange (Cu2OCu2O) bands of the ...
In addition, other researches have also suggested the use of ultrasound treatment as an alternative technology to improve the safety and quality of apple juices by preserving its nutrients and sensory properties [28]. In the case of orange juice, it is well known that its colouring is greatly...
Aluminum, also referred as “CI pigment meta”, can be used as a food colouring (E173l), being a silvery-grey powder or tiny sheets which are insoluble in water and in organic solvents [7]. Aluminum powder consists of finely divided particles that eventually can be carried out in the pre...