The phrase "a colour change" is correct and usable in written English.
It can be used when describing a shift in color, often in scientific, artistic, or everyday contexts.
Example: "The experiment showed a colour change when the pH level was adjusted."
Alternatives: "a color shift" or "a change in color".
The strongly coloured washcloth IW1 shows a colour change in going from pH 6 (green) via 7 (greenish yellow) to pH 8 (orange-red) and pH 9 (red) with a pK a value of around 7.3 (Fig. 4).
A colour change represents a different electron decay process from a different atomic arrangement31.
The hydrolysis of the ester bond of these chromogenic compounds leads to a colour change, which can be readily monitored.
The simplest technique involves a pen-like device that causes a colour change in ink that contains the DNA fragments.
The oxygen triggers a colour change that is made visible after desired timing period at corresponding diffusion lengths.
The sensing process was marked by a colour change from colourless to yellow, and an intriguing 120-fold turn-on green fluorescence.
LAMP amplicons were analyzed by 2% agarose gel electrophoresis or by visual inspection of a colour change emitted by fluorescent dye.
The sensory materials respond with a colour change to the presence in water of Fe(III), Co II), Cu II), and Sn II).
Although some fish may complete a colour change within a minute (compared to half a second or less for cephalopods), most vertebrates require several minutes to several hours.
Details included a colour change in the feature known as The Giant Red Spot as well as a remarkable wave above Jupiter's equator.
Although the visible change of the indicator is usually a colour change, in some cases it is a formation or disappearance of a turbidity.
