Storage Environment Godown

Months in Storage months

Storage Temperature °C

Relative Humidity %

Reference Temperature °C

Reference Humidity %

Fabric & Sensitivity Material

Residual Size Content %

Reference Size Content %

Rate Increase per % Size ×

Base Yellowing Rate b*/month

Rate Factor per 10 °C ×

Rate Factor per 10% RH ×

Initial b* Value b*

Acceptance Limit b*

Current Yellowness

— b*

After the storage period given

Aging Analysis

Yellowing Rate: — b*/month
Temperature Factor: — ×
Humidity Factor: — ×
Residual Size Factor: — ×
Months to Acceptance Limit: — months
Months Past Limit: — months

Linear yellowing is a simplification of an autocatalytic process — degradation products themselves accelerate further degradation, so real b* curves bend upward and this understates long storage. Much greige yellowing is also reversible in scouring and bleaching, so the b* figure predicts what arrives at the dyehouse rather than what survives it; the ones that matter are the fractions that do not clear, particularly on pale shades and optically brightened whites. Fabric stored against a damp wall or under a leaking roof ages on its own schedule and no environmental average describes it.

Greige Fabric Warehouse Aging & Yellowing Predictor — free, with the formula and a worked example, at Textile School.