The colour process of a BJJ gi is different from normal clothing.
BJJ gi fabric is usually heavier, with a tighter weave structure. During training, it goes through repeated gripping, friction, sweat, and washing. Because of this, the colour cannot only look good when it is first dyed. Colour fastness, dye penetration, fabric feel, shrinkage performance, and bulk production consistency all need to be considered together.
Different dyes, different dyeing equipment, different washing processes, and different finishing treatments can all affect the final result.
This is why, in BJJ gi production, dyeing is not just an appearance step. It is an important part of overall production quality control.
In cotton BJJ gi fabric production, the common dyeing methods mainly include reactive dyeing and sulfur dyeing.
Reactive dyeing is commonly used for cotton fabric. Its main features are brighter colours, cleaner colour tones, and relatively stable wash fastness. It is suitable for BJJ gis that require clearer colour presentation and better overall stability.
Compared with sulfur dyeing, reactive dyeing also has more advantages in terms of environmental and safety control. It does not rely on the sulfur dyeing process to create dark colour effects, and chemical residue is generally easier to control. This is why more high-quality cotton fabrics are now choosing reactive dyeing.
The limitation of reactive dyeing is that, when used for dark colours, it requires stronger process control.
Especially for BJJ gi fabric, which is thicker and more tightly woven, if the dyeing time is not enough, the soaking is not sufficient, or the dye does not fully enter the fibres, the colour may look acceptable on the surface. But after long-term training, friction, and washing, the colour fastness and dye penetration may be affected.
In comparison, sulfur dyeing has stronger advantages in deep colour performance. It can create darker, heavier colour effects and is also suitable for large-scale production of dark cotton fabrics. For heavy BJJ gi fabric, if the process is well controlled, sulfur dyeing can provide strong dye penetration and dark colour stability.
However, sulfur dyeing also has some clear challenges.
This process usually involves reduction, oxidation, washing, and finishing treatments. If these steps are not controlled properly, the fabric may develop odour, greying after washing, fading, or unstable colour fastness.
More importantly, sulfur dyeing has higher requirements for environmental treatment and chemical residue control. If the washing is not sufficient, or if the finishing process is not properly handled, residue control may become an issue. For a BJJ gi, which is worn directly against the skin, exposed to sweat, and washed repeatedly, this is something that needs special attention.
Besides the choice between reactive dyeing and sulfur dyeing, the dyeing process itself also affects the final result. For example, continuous dyeing and vat dyeing have different performance in production efficiency, dye penetration, and colour stability.
Continuous dyeing is suitable for large-volume continuous production. The fabric continuously passes through dye liquor, padding rollers, fixation, washing, and drying processes.
Its advantage is high efficiency. It is suitable for bulk production, and when the same batch of fabric is produced continuously, colour consistency is relatively easier to control.
However, the key to continuous dyeing is process control. Because the contact time between the fabric and the dye liquor is shorter, the pick-up rate, pressure, machine speed, temperature, fixation time, and washing process all need to be carefully controlled.
For BJJ gi fabric, which is heavy and tightly woven, if the dye liquor does not penetrate well enough, the surface colour may reach the expected result, but the internal dye penetration may not be sufficient.
This issue may not be obvious at first. But after long-term training, friction, sweat, and washing, high-friction areas may be more likely to become lighter, fade, or lose colour stability.
So continuous dyeing is not a bad process. It simply relies more on equipment stability and process control. For thick fabric, whether the dye truly penetrates the fibres is more important than production speed.
Vat dyeing is a batch dyeing process.
Unlike continuous dyeing, where fabric quickly and continuously passes through dye liquor, vat dyeing places the fabric into a dyeing vat. Through longer soaking, circulation, heating, and holding time, the dye slowly enters the fibres.
For BJJ gi fabric, which is thicker and more tightly woven, the advantage of vat dyeing is that the dyeing time is more sufficient. If the temperature, time, dye circulation, and finishing process are well controlled, the colour can penetrate more thoroughly, and the inner and outer colour can be more stable.
For some dark colours or fabrics that require stronger dye penetration, vat dyeing can have an advantage. It does not only make the surface colour meet the standard; it also gives the dye more time to enter the fibres.
But vat dyeing also has disadvantages.
First, its efficiency is lower than continuous dyeing, and the production time is longer. It is not ideal for bulk production where speed is the main priority.
Second, between different vats and different batches, if the temperature, time, dye ratio, and bath ratio are not controlled well, batch colour difference may occur.
Also, vat dyeing usually requires more water and stronger post-treatment control. After dyeing, sufficient washing, fixation, and finishing are needed. Otherwise, colour fastness, fabric feel, and later shrinkage performance may all be affected.
So vat dyeing is not simply “better.” It is more suitable for products that require stronger dye penetration, colour depth, and fabric stability. For thick cotton BJJ gi fabric, if the process is well controlled, vat dyeing can provide more stable dye penetration and colour fastness.
How Friction, Sweat, and Washing Affect Colour
The use environment of a BJJ gi is more demanding than normal clothing.
During training, the fabric is repeatedly gripped and rubbed. On dark gis, high-friction areas such as the sleeve cuffs, pant hems, collar, and knees are usually the first places to show colour change. If the dyeing is not deep enough, or if the colour fastness is not stable enough, these areas may become lighter or fade more quickly.
Sweat can also affect colour performance. During training, the fabric stays in contact with sweat for a long time. If the perspiration fastness is not good, the colour may gradually become dull, grey, or uneven in certain areas.
Washing method is also important. Hot water washing, long soaking, strong alkaline detergents, and direct sun exposure can all speed up colour change. Especially for dark cotton BJJ gis, even when the dyeing process is well controlled, proper washing is still important for keeping the colour more stable.
This is why, when we look at the colour of a BJJ gi, we do not only look at how the colour appears when it is first produced. We also look at how it performs after training, friction, sweat, and repeated washing.
Our Understanding
For BLITZFIGHT, dyeing is not a simple choice.
Different colours, different fabrics, different order quantities, and different customer requirements may all require different process decisions.
Some colours need better brightness and cleaner tones.
Some dark colours need stronger dye penetration.
Some bulk orders need more stable batch consistency.
Some custom orders need the sample colour and bulk production colour to stay as close as possible.
After years of experience in BJJ gi production and custom manufacturing, we have gradually developed our own process judgment and workflow.
We do not only chase darker colours, and we do not only chase production efficiency. What truly matters is finding the right balance between colour performance, colour fastness, fabric feel, shrinkage control, environmental safety, and bulk production stability.
A good BJJ gi is not only decided by design and stitching.
From fabric selection, weaving, dyeing, washing, and pre-shrinking to final cutting and sewing, every step affects the final wearing experience.
Colour processing is one of the key steps behind that result.