Lab Dip Approval against Bulk Shade under Three Illuminants
Tri-illuminant shade approval aligns lab dips with bulk by enforcing primary D65 visual matching alongside secondary TL84 and Illuminant A metameric tolerances.
Liquor Ratio Variation
Volumetric Shift
Fluctuations in the weight of liquid relative to the weight of the textile material can significantly alter the final color of a batch. Any liquor ratio variation changes the concentration of chemicals and dyes available to the fibre during the immersion process.
Dye Concentration
Lower volumes of water increase the frequency of contact between the fabric and the dissolved pigments. When liquor ratio variation occurs unexpectedly, the resulting shade may be darker or more saturated than the laboratory recipe intended. This relationship is particularly sensitive in reactive dyeing where the salt concentration must stay within a narrow range.
A mill that starts with a one to ten ratio but finishes with one to twelve will struggle to maintain consistency across multiple machines.
Machinery Limit
Modern dyeing vessels are designed to operate at low water levels to save energy and reduce environmental impact. If a machine is underloaded, the liquor ratio variation becomes harder to manage because the pump may not be fully submerged.
Shading Impact
Uneven water levels lead to listing and ending defects in finished goods. Strict control over liquor ratio variation is the only way to ensure that a hundred rolls of fabric look identical in a retail environment.