Lab dip and colour matching, explained
A buyer approves a colour, and weeks later the bulk shipment arrives a shade off from what they thought they'd signed off on. Most of the time this isn't a supplier cutting corners — it's a gap in how colour approval actually works, and what a lab dip is for.
What a lab dip is
A lab dip is a small swatch of fabric, dyed in a lab-scale batch, made specifically to match a target colour before a single metre of bulk fabric goes into the dye vat. It is not a marketing sample or a stock colour card — it is dyed against your specific target, checked, and only becomes the reference for bulk production once you've approved it.
How the sequence actually runs
You send a target — a Pantone reference, a physical swatch, or a reference towel you already buy elsewhere. The mill dyes a lab dip against that target and sends it back, usually as a small physical swatch rather than a photograph. You check it against your target in person and either approve it, or send it back with adjustment notes ("too warm," "half a shade darker") for another round. Once you approve a physical lab dip, that swatch — not the original photo or Pantone chip — becomes the standard the bulk dye batch is checked against.
Why a screen photo is not a substitute
Every phone camera and every screen renders colour slightly differently, and dye colour shifts under different light sources the way most fabric does — a shade that reads accurately under office fluorescent light can shift under daylight or warm indoor lighting. Approving a colour from a photo on a screen means approving something that was never actually the colour in question. A physical lab dip swatch, checked under consistent lighting, is the only approval that bulk dyeing can be reliably checked against.
Why bulk can still vary slightly from an approved lab dip
Dyeing at bulk scale is not simply the lab dip recipe multiplied up. Batch size, water, and dye lot all introduce small variables, which is why a serious mill checks bulk output against the approved lab dip swatch before it ships, not after. Some tolerance is normal in dyed textiles industry-wide; what matters is that the check happens against your approved physical reference, not against memory or a photo.
What this means for a reorder
If you're reordering the same colour months or years later, the original approved lab dip swatch — not a description of the colour, not the invoice line item — is what a reorder should be matched against. Keeping that swatch on file on your end is worth doing for exactly this reason.
What to ask for
If a supplier only ever sends colour references as photographs and skips the physical lab dip step, that's worth questioning before you commit to a colour for a full order. Ask for a physical lab dip swatch before bulk dyeing runs, and keep it once you approve it.
Tell us your target colour — a Pantone reference, swatch, or reference product — and our export team will confirm the lab dip process and timeline for your order.