Color is the most subjective part of any fabric order and the one most often settled by email — which is exactly how a "deep navy" arrives a shade too blue. Every plush and fleece blanket, pet bed and throw you drop ships starts with a color conversation between you and a dye house. The good news: the industry has a repeatable, objective process for it, and once you know it you can lock color before a single bulk meter is dyed. This is the same process we run at our Changshu mill for coral fleece, polar fleece and lamb wool orders.
The lab dip: your physical proof of color
A lab dip is a small swatch of your actual production fabric, dyed to match your target color and sent to you for approval before bulk dyeing. The two words that matter are "actual" and "physical." The same recipe reads differently on cotton than on polyester — cotton takes reactive dyes while polyester needs disperse dyes, an entirely different chemistry. So the dip must be made on the exact GSM and knit structure you plan to order, not a generic stand-in.
What to send (and what not to)
- Pantone TCX is the cleanest reference. TCX chips are dyed on cotton fabric, so the dye house is matching fabric to fabric.
- A physical swatch of your own product works just as well, often better if you're matching an existing line. Send a piece big enough to evaluate, kept out of sunlight so it hasn't faded.
- A hex code, screenshot or photo won't work. Screens are backlit and uncalibrated — no dye house can match to one. Pantone's paper systems (TPG and the older TPX) also introduce error because paper and textile reflect light differently.
What comes back and how to judge it
A mill typically returns two or three lab dips per color, deliberately bracketed — one lighter than target, one on target, one slightly deeper. This isn't indecision; it gives you a choice that accounts for how the color reads at scale on your fabric. For high-pile fleece, mills like ours often produce three to four variant recipes to bracket the target shade.
Judge the dips in a light box under standard illuminants, never at your desk: D65 for daylight, TL84 for retail fluorescent, A (incandescent) for warm home light. The reason is metamerism — two fabrics can match perfectly under one light and visibly separate under another. A color that matches in store light but splits apart in daylight is a real, common failure that you'll only catch if you look at the swatch in more than one place.
Numerically, mills report a Delta E (ΔE) reading — commonly a ΔE 1.0 or below under D65 is accepted for commercial bulk fleece, written into the contract. Ask for the spectrophotometer number alongside the physical swatch; it predicts metamerism risk better than your eye alone. Visual evaluation is still the final word (AATCC-style visual assessment under agreed light) — use both, not just one.
Three things that quietly shift your shade
- Fabric weight. A heavier GSM fleece absorbs more dye and traps more light, so it reads deeper than the same recipe on a lighter GSM. Always spec GSM before color.
- Recycled polyester. GRS-certified recycled yarn often carries a duller or slightly yellow base tint, so the dye recipe must be adjusted to hit the same Pantone on a recycled substrate.
- Functional finishes. Anti-pilling, water-repellent and other treatments alter how the surface refracts light. Insist the finish be applied to your lab dip, not added after approval.
Color fastness — the tests a buyer can actually ask for
A great match on day one means nothing if the color bleeds after the first wash. Ask the mill for fastness reports against the standard tests: ISO 105-C06 (washing), ISO 105-X12 (rubbing) and ISO 105-B02 (light). For fleece and pet blankets, high-temp disperse dyeing at around 130 °C delivers the best fastness grades, typically 4–5 on the grey scale. Eco-minded buyers should also check the fabric meets OEKO-TEX Standard 100 — a useful signal that restricted substances are out of the dye formula.
Why a perfect dip doesn't guarantee a perfect bulk run
Lab dips are dyed in small vats with fresh water; bulk runs use large jet machines and different dye lots. A clean ΔE of 0.4 on the dip can drift to 1.8 on the roll. Two controls keep this manageable: agree on a shade band (acceptable lot-to-lot variation) in your contract, and require that bulk dyeing starts from the same greige lot used for the dip. If a reorder comes months later, ask for a fresh dip — fiber batches, machine runs and formulas can all shift in between.
Ordering dyed fleece — what to send us
To get an accurate FOB quote fast, send: fabric type (coral fleece, polar fleece, lamb wool, etc.), GSM, width, your color standard (Pantone TCX or a physical swatch), end use and quantity. Dyeing and finishing typically starts around 100–200 kg per color; for smaller needs ask about our stock colors and low-batch options.
Request a Color Quote → See Our Fleece Fabrics
References
- PRP Apparel — The Lab Dip Approval Process: How Color Gets Locked Before Bulk Dyeing
- HonryFleece — Polar Fleece Fabric Color Matching: Pantone and Lab Dip
- OEKO-TEX — OEKO-TEX Standard 100