What is Grayscale? How to use it?

What Is Grayscale? How To Use It?

What Is Grayscale?

Grayscale is used for assessing the color shading in between products and the customer's approval sample or among pieces in production. Grey scaling has grades 1-5 and increases by half of the grade (1, 1 1/2, 2, 2 1/2, and so on.) with 5 being the greatest. Generally speaking, many overseas clients can accept above grade 4, while some can accept the grades 3-4.

There are two types of Grayscale (Gray Scale)-- one for evaluating 'color modification' and one for evaluating 'staining'. The color change scale consists of nine sets of grey-coloured chips, from grades 1 to 5.

How to use Grayscale?

For color staining. It mainly is used for examining staining after rubbing with dry and wet white cotton cloths, in a professional lab. The employee usually attaches one white cotton cloth to the sample. Then, they will put them together into a washing maker and observe the outcome. An inspector usually cannot perform this test on-site given that the equipment and time are restricted. Rather, an inspector may carry out a rub test for color staining. To do this, the Inspector ought to prepare 2 pieces of white cotton material: one wet and the other dry. The garments quality inspector will rub the production sample 10 times with both with a force 9N (1KG).

Nowadays, a lot of 3rd party inspection companies are increasing their inspectors' skills and training on how to utilize special tools to examine product quality. For example, during a soft-goods or fabric inspection, the most essential tools that will be used are newton meters, metal detectors, barcode scanners, Pantone books, and so on. While all these tools are important, the only way to assess the color shades accurately during a textile quality inspection is the Grayscale.

Understanding the Grayscale Grading System

The grayscale grading system is standardized under ISO 105-A02 (for color change) and ISO 105-A03 (for staining). Each scale provides a numerical rating that helps inspectors, manufacturers, and buyers communicate objectively about color quality. A grade of 5 indicates no visible change or staining, while a grade of 1 indicates a severe change. The half-step increments (such as 3-4 or 4-5) allow for more precise assessments when the result falls between two full grades.

For most international markets, particularly in Europe and North America, a minimum grayscale rating of 4 is required for color fastness to washing and rubbing. Products scoring below this threshold are typically rejected during pre-shipment inspection because they are likely to bleed, fade, or transfer color during normal consumer use.

When Is Grayscale Testing Applied?

Grayscale testing is most commonly applied during quality control inspections for textile and garment products. Inspectors use grayscale cards at several critical checkpoints: during raw material verification (to confirm fabric meets the approved color standard), during production (to monitor batch-to-batch consistency), and during the final pre-shipment inspection (to confirm finished goods match the buyer's approved sample).

Beyond textiles, grayscale evaluation is also relevant for leather goods, printed materials, dyed plastics, and any product where color consistency and durability are commercial requirements. The testing methodology remains the same — comparing the tested sample against the standardized grey chips under controlled lighting conditions (typically D65 daylight or equivalent).

Grayscale Expected Results

1. There needs to be no color transfer even worse than grade 4 on a Grayscale (between the initial white fabric and the colored one) after the dry test.
2. There must be no color moved even worse than 3-4 on a Grayscale (in between the initial white fabric and the colored one) after the wet test.
3. In order to get the most from your outcomes, the inspector must make certain to analyze the technique and outcome and discuss it with the factory plainly.

The factory must be able to help, such as by providing great quality 100% cotton white fabric and supplying excellent room lighting and conditions. In a textile inspection, the inspector's experience is extremely essential when performing this test, so make certain to utilize a trustworthy Quality Control Company provider!