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In order to create a commercial system for blending precoloured fibres that will appear visually solid once combined, it is necessary to understand the maximum colour difference required between the blend components. Based on this understanding, the lowest number of primaries required to populate a given colour gamut can be determined. A series of psychophysical experiments was carried out to explore the colour difference between fibre‐blend components and whether the resulting blended samples are perceived as visually solid. Experiments were carried out with loose stock fibre, yarn and knitted samples. Generally, it was found that the likelihood a blend appeared as visually solid increased as the average colour difference between the blend components, or primaries, decreased. The value of the mean colour difference at which 50% of participants viewed the blend as being visually solid was found to be 20.8, 20.5 and 18.0 for fibre, yarn and knitted samples, respectively. Consequently, it was found that it was more difficult to obtain a solid shade with the knitted form than with the loose stock fibre form.

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LGC is the UK's designated National Measurement Institute for chemical and bioanalytical measurement, and through this role improves the quality and international acceptance of measurements performed within the UK. This research spotlight, highlighting measurement 'across the scale', from elemental analysis and small molecules, through to proteins, DNA and RNA and on to whole cells and tissues, demonstrates how LGC is supporting the clinical sector by ensuring sound measurement practice that underpins clinical efficacy, quality assurance and patient safety.