5.0 on Google · Trusted by 1,200+ Brands · Custom Clothing Manufacturer · Made in the USA
TLDR: The color approval process ensures your final garment matches your design intent. It involves using a universal standard like Pantone, requesting dyed fabric samples (lab dips) from the factory, and evaluating them under controlled lighting. A disciplined process prevents costly production errors, reduces waste, and maintains brand consistency across different materials and production runs.
In apparel manufacturing, an incorrect color is not a minor detail; it is a catastrophic failure that can invalidate an entire production run. Brands often struggle with achieving color consistency across different fabrics, leading to mismatched garments, delayed shipments, and significant financial losses when thousands of yards of fabric are dyed to the wrong shade. This problem is agitated by variables like fabric content, dye house capabilities, and inconsistent evaluation methods, turning a seemingly simple task into a major production bottleneck.
This article provides a comprehensive, factory-floor guide to mastering the color development and approval workflow, detailing the technical steps, potential pitfalls, and downstream production impacts, ensuring you can implement a repeatable system for perfect color, every time.
The color approval process is a foundational step in pre-production that translates a brand’s color vision into a tangible, reproducible result on bulk fabric. It is a systematic quality gate designed to prevent shade variations that can compromise a collection’s integrity. The goal is to create a physical, approved standard that the factory will use as a benchmark for the entire production run, ensuring that the first t-shirt produced matches the last one.
At its core, this process hinges on two components: a universal color reference and a sample for evaluation. The most common reference system is Pantone, specifically the Fashion, Home + Interiors (FHI) system. The Pantone Textile Cotton eXtended (TCX) swatch is the industry standard for cotton and other natural fibers, while the Textile Paper Green (TPG) is often used for hard goods and surface prints. Once a brand provides a Pantone TCX number or a physical swatch of their chosen color, the factory’s dye house begins the lab dip process.
The first step is defining the master standard. This must be a physical reference. Sending a digital RGB or CMYK value is a common mistake that leads to failure. A factory cannot dye fabric based on a color seen on a backlit computer screen. The standard should be a recent Pantone TCX swatch (as they can fade over time) or a piece of previously produced fabric that the brand wants to replicate. This standard is sent to the factory and becomes the “target” that every submission will be measured against.
A lab dip is a small swatch of the actual production fabric (e.g., a 180 GSM 100% combed cotton jersey) dyed to match the color standard. The dye house uses specialized lab equipment to create multiple formulations, adjusting the dye recipe to get as close as possible to the target. They will typically submit 3-5 options per color, mounted on a card, clearly labeled with the formula variations. These are sent to the brand for evaluation. This is not just a swatch; it is a proposed contract for the color of your bulk production fabric.
This is the most critical stage and where most errors occur. Lab dips must be evaluated in a light box, a standardized viewing booth that contains multiple calibrated light sources. The primary source is “Daylight” (D65), which simulates natural daylight. Other essential sources include “Cool White Fluorescent” (CWF), common in retail stores in the USA, and “Tungsten” (A) or “TL84,” found in European stores. Comparing the lab dip to the standard under each of these light sources is crucial for identifying metamerism. If the colors match under D65 but not under CWF, the dip is a metameric failure and must be rejected.
Feedback must be precise. Approvals are typically graded on a scale (e.g., A, B, C). “A” is an excellent match, approved for production. “B” is an acceptable match with minor deviations. “C” is unacceptable and requires a new submission. If rejecting, the feedback must be descriptive. Instead of “make it darker,” provide instructions like “this is too green, reduce yellow and add 5% more blue.” For highly technical operations, a spectrophotometer is used to measure the color numerically, and approval is based on a “Delta E” (dE) value, which quantifies the difference between the standard and the dip. A dE of less than 1.0 is generally considered a commercially acceptable match.
The physical and chemical properties of a fabric have a profound impact on how it accepts dye and the final color’s appearance. A single Pantone color will look vastly different on cotton versus polyester, and achieving a perfect match across a collection using multiple fabric bases is one of the greatest challenges in apparel production. Understanding these differences is key to setting realistic expectations and troubleshooting issues.
Cotton, linen, and other cellulosic fibers are typically dyed with reactive dyes. These dyes form a covalent bond with the fiber, resulting in excellent wash fastness and vibrant colors. However, the quality of the raw cotton—its maturity and cleanliness—can cause variations. Mercerization, a chemical treatment process that swells the cotton fibers, increases luster and dye affinity, making it easier to achieve deep, saturated shades. A 220 GSM French terry will absorb more dye and may appear darker than a 150 GSM jersey of the same color due to its loft and structure.
Polyester is a non-polar, hydrophobic fiber, meaning it repels water. It cannot be dyed with the same dyes used for cotton. Instead, it requires disperse dyes, which are non-ionic and can be “dispersed” in water. The process requires high temperatures (around 130°C or 266°F) and high pressure to force the dye molecules into the fiber structure. This process is energy-intensive and can be challenging for achieving certain bright colors, particularly electric blues and deep reds. Colorfastness to sublimation (heat resistance) is a key QC check for polyester, as color can migrate or bleed if not dyed correctly.
Blends like 60/40 cotton/polyester or tri-blends (polyester/cotton/rayon) present the most complex dyeing challenge. Because each fiber type requires a different class of dye, the fabric must be dyed in a two-step process. First, the polyester is dyed with disperse dyes at high temperature. Then, the machine is cooled, and the cotton is dyed with reactive dyes in the same bath. This is called two-bath or union dyeing. The goal is a solid, uniform color where the polyester and cotton components match perfectly. Any imbalance in the dye recipe will result in a “heathered” or uneven appearance, making color approval for blends a highly technical and time-consuming task.
Use this table as a quick reference when planning your collection to understand the inherent challenges and properties associated with dyeing different base materials.
| Fabric Type | Primary Dye Class | Color Matching Difficulty | Common Quality Risks |
|---|---|---|---|
| 100% Cotton | Reactive | Low to Medium | Shade variation between lots, poor crocking (rub-off) if not washed properly. |
| 100% Polyester | Disperse | Medium | Metamerism, dye migration (sublimation), difficulty hitting bright shades. |
| Cotton/Poly Blends | Disperse & Reactive | High | Poor union (un-even color), fiber staining, lower colorfastness. |
| Nylon | Acid | Medium to High | Prone to fading with UV exposure (poor lightfastness), atmospheric contaminants can cause yellowing. |
| Rayon/Viscose | Reactive or Direct | Low | Excellent dye uptake and bright colors, but prone to excessive shrinkage and poor wet strength. |
A delay or error in the color approval stage creates a domino effect that disrupts the entire production timeline and budget. It is not an isolated creative decision; it is a critical engineering checkpoint with significant operational consequences. A seasoned production manager tracks lab dip approvals as closely as any other milestone because they understand the downstream costs of failure.
Once a lab dip is approved, the factory can place the order for bulk fabric dyeing. The typical lead time for greige fabric knitting and dyeing in a US-based or near-shore mill is 4-6 weeks.
If the lab dip process takes three weeks of back-and-forth submissions instead of one, the entire production schedule is pushed back by two weeks. This delay can cause you to miss a delivery window, resulting in retailer chargebacks or the need for expensive air freight instead of ocean freight.
Even with an approved standard, slight variations can occur between different dye lots in bulk production.
If these variations exceed the agreed-upon tolerance, the factory’s quality control team must segregate the fabric rolls into “shade bands.” During cutting, each shade band must be cut separately to ensure all components of a single garment (e.g., front body, back body, sleeves) come from the same shade. This prevents mismatched panels on the finished product.
However, this segregation kills marker efficiency. Instead of cutting 50 plies of fabric at once for an entire size run, the team might have to create three separate markers and cut three smaller stacks. This increases fabric waste, labor time, and overall garment cost.
The final color is not locked in until after the finishing workflow. Processes like heat-setting, sanforization (pre-shrinking), or applying a brushed finish can slightly alter the fabric’s shade.
For example, the high heat used to cure printed graphics can cause some polyester dyes to sublimate, changing the fabric color underneath. Therefore, in-line QC checks are performed to compare finished garment panels against the approved standard. An end-line QC audit before packing will also include a final check for shade consistency across the order, pulling garments from different boxes to ensure uniformity.
Delta E (dE) is a numerical value that represents the distance between two colors in a color space. It’s a way to quantify the difference that the human eye perceives. A dE of 0 means the colors are identical. A dE of 1.0 is the smallest difference a human eye can typically detect. In apparel manufacturing, brands and factories often agree on an acceptable dE tolerance, usually between 1.0 and 1.5, for lab dip and bulk production approval. Using a spectrophotometer to get a dE value removes subjectivity from the approval process.
Metamerism is a phenomenon where two colors appear to match under one lighting condition but not under another. This can be disastrous for a brand. For example, a jacket and a matching pant might look perfect in the factory (under fluorescent lights) but appear as two different shades of navy blue when the customer wears them outside in natural daylight. This is caused by using different dye stuffs or fabrics that reflect light differently. The only way to prevent this is by evaluating lab dips in a light box with multiple light sources (D65, CWF, TL84) before approving the color for production.
No, this is a common and costly mistake. Pantone produces different color systems for different materials. The TPG (Textile Paper – Green) system is for pigments on paper, used for paints, coatings, and hard goods. The TCX (Textile Cotton eXtended) system uses dye on cotton fabric. The substrates are different, and the colorants are different, so a TPG color will never be an exact match to a TCX color. If your primary product is apparel, you must use the TCX system as your standard to ensure an achievable target for the dye house.
At MFG Merch, we manage the entire color development and approval workflow as a core part of our service. We guide clients in selecting the correct Pantone TCX standards and manage all communication with the dye house. Our team evaluates every lab dip submission in-house using professional light boxes and provides clear, technical feedback to ensure speed and accuracy. By standardizing this process, we mitigate risks for our clients, prevent costly errors, and ensure the final product’s color matches their brand vision perfectly.
A lab dip is a sample of solid-color dyed fabric. Its purpose is solely to approve the color. A strike-off is a sample of printed fabric, typically a small section or one repeat of the print pattern. Its purpose is to approve the print’s colors, scale, registration (alignment), and hand-feel. While both are pre-production approval samples, lab dips are for solid colors, and strike-offs are for prints, patterns, or graphics.
No. 2,666 with 121% Three-Year Revenue Growth MFG Merch has been named to the 2026 Inc. 5000, ranking No. 2,666 among America’s fastest-growing private
Artwork is finalized, a garment is selected, and a buyer is waiting for approval. The question isn’t whether to show something before production. It’s
A quote is on the table, the per-unit cost looks fine, and then there’s a line item for a set-up fee that nobody explained.
