Dye Lot
A dye lot is a batch of fabric or yarn dyed together in a single cycle. Each lot has slight shade variations that must be tracked for order consistency.
A dye lot refers to fabric or yarn dyed together in a single dyeing cycle using the same machine, recipe, and operator. Even with identical inputs, different lots produce slightly different shades due to water chemistry, temperature variance, and dyestuff batch-to-batch variation.
Buyers expect shade consistency within an order. Mixing dye lots within the same shipment causes visible shade variation in finished garments — a major cause of rejected orders in the textile industry.
Dye lot tracking is critical for: (1) allocating the right rolls to the right customers, (2) matching replacement orders, (3) maintaining traceability for quality issues, and (4) preventing shade-mismatch claims from export customers.
Generic ERP systems treat a fabric SKU as a single item. Textile-specific ERPs like Vastra ERP treat each dye lot as a distinct sub-SKU with its own shade coordinates, inventory balance, and allocation history.
Frequently Asked Questions
What is a dye lot in textiles?
A dye lot is a quantity of fabric or yarn dyed together in a single cycle, using the same machine, the same recipe and the same operator. Every roll produced in that cycle shares the lot's colour characteristics.
Why do two dye lots of the same colour look different?
Even with an identical recipe, small variations in water chemistry, bath temperature and dyestuff batch produce slightly different shades. The difference is usually invisible on its own and obvious when two lots are placed side by side in a finished garment.
What happens if you mix dye lots in one shipment?
Visible shade variation in the finished garments, which is one of the most common causes of rejected export orders. Buyers expect shade consistency within an order, so rolls from a single lot should be allocated together.
How do manufacturers track dye lots?
Each lot is treated as a distinct inventory record rather than as part of a single fabric SKU, carrying its own shade coordinates, balance and allocation history. Generic ERP systems model a fabric as one item code, which is why textile-specific systems track the lot as a sub-SKU.
Can a dye lot be reproduced exactly at a later date?
Not exactly. A re-dye can be matched within an agreed tolerance, measured in Delta-E against a master standard, but it will not be identical. This is why replacement and top-up orders must be matched against the original lot's recorded shade values.
Related terms
Shade Matching
Shade matching is the process of ensuring consistent color across different dye lots, rolls, or production runs using spectrophotometer readings.
Fabric Roll
A fabric roll is the standard shipping unit for textile fabric, typically 50-150 meters. Each roll has unique attributes: dye lot, shade, GSM, width.
4-Point Inspection System
The 4-point system grades fabric quality by assigning penalty points for defects based on length and severity. It's the textile industry's standard quality method.
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