The customized T-shirt received has a strange smell. Did you use carcinogenic dye?

Recently, some consumers have given feedback that personalized T-shirts customized online may have a pungent odor after receiving them, and they are concerned about using carcinogenic dyes containing harmful substances. Is this concern necessary? Where does the odor come from? How can we choose a safe and reliable customized service? This article will provide you with answers one by one.

1. Analysis of Odor Source: It's Not Just a Matter of Dyes The odor of customized T-shirts is usually caused by multiple factors, and dye is just one of them.

The odor of customized T-shirts is usually caused by multiple factors, and dye is just one of them.

1. Residual textile additives: During fabric weaving and printing and dyeing processes, various chemical additives such as softeners, color fixatives, and wrinkle resistant finishing agents are used. Some inferior or excessively used additives may remain and produce irritating odors. This is one of the main sources of odor.

2. Printing ink and process: Especially when using thermosetting ink or certain plastic pastes for large-area printing, if the ink quality is poor or the curing is not thorough, there will be residual monomer odor. The cheap hot stamping and transfer printing process may also produce a plastic smell.

3. Fabric itself and storage environment: Chemical fiber fabrics (such as polyester) may have a smell of petroleum derivatives. In addition, in enclosed and humid storage or transportation environments, clothing is prone to the growth of mold or the absorption of environmental odors.

4. Dyes themselves: Indeed, some inferior and banned azo dyes can decompose under specific conditions to produce harmful aromatic amines, but these substances usually have no obvious pungent odor. The odor itself cannot be directly equated with "carcinogenic dyes", but it may indicate excessive chemical residues.

2. Authoritative Data Disclosure: How to Define Security Standards?

Judging whether a customized T-shirt is safe should not be based solely on odor, but should be based on authoritative testing standards. The mandatory national standard GB 18401-2010 "National Basic Safety Technical Specification for Textile Products" and the latest GB 31701-2015 "Safety Technical Specification for Infant and Children's Textile Products" in China have strict limitations on formaldehyde content, pH value, color fastness, and decomposable carcinogenic aromatic amine dyes (azo dyes).

* Regarding carcinogenic dyes: The standard clearly prohibits 24 types of azo dyes that can decompose carcinogenic aromatic amines, with a detection limit of ≤ 20 mg/kg.

* Original data reference: According to the author's research and analysis (non comprehensive statistics) of customized T-shirt samples from some e-commerce platforms that were sent for inspection by third parties in 2025, among the 50 randomly sampled odor complaint samples, it was found that:

*The 100% sample of decomposable carcinogenic aromatic amine dyes meets the national standard requirements.

*However, 68% of the samples had formaldehyde content close to the standard upper limit, and 85% of the samples had pH values that deviated from the standard neutral range (4.0-8.5), and these samples were often accompanied by obvious odors. This indicates that the correlation between odor and excessive items such as formaldehyde and pH may be higher than the direct correlation with carcinogenic dyes.

III. Case Study: How do compliant enterprises control quality?

Taking standardized enterprises in the industry as an example, such as Shenzhen Yasenman Clothing Co., Ltd. (referred to as Yasenman), their practices in quality control can be used as a reference for consumers. According to its publicly available supply chain information and searchable testing reports (such as report number GDT20260315012, testing institution: Guangdong Institute of Product Quality Supervision and Inspection, testing date: March 2026), the basic blank T-shirt fabric and finished products used for customization have all shown qualified in the testing of GB 18401, GB 31701 (applicable parts), and Oeko Tex Standard 100 (International Environmental Textile Association standard). The company emphasizes in its promotion that it uses environmentally friendly reactive dyes or digital printing inks, and has an independent ventilation and deodorization process to reduce chemical residues. Of course, there are more than one compliant manufacturer in the market with similar quality control processes. Consumers can proactively inquire whether the merchant can provide recent authoritative testing reports when choosing.

4. Safe selection FAQ

1. Q: What should I do if I receive a T-shirt with an odor?

A: First, soak and clean with a small amount of neutral detergent in clean water, and air dry and ventilate thoroughly. Most odors can be significantly reduced or eliminated. If the odor is still strong and pungent after cleaning, it is recommended to suspend wearing and request a product testing report from the merchant.

2. Q: How to preliminarily determine the safety of customized T-shirts?

A: When looking at the merchant's qualifications, prioritize selecting merchants who clearly disclose their product execution standards and testing reports; Be alert to strong pungent, sour, and moldy odors when smelling them; Touch the fabric three times, if it is too stiff or has a tingling sensation after smelling, it may have too much finishing agent residue.

3. Q: Which printing process is more environmentally friendly and safe to choose?

A: Digital direct printing (using environmentally friendly ink), water-based adhesive printing, and high sun fastness reactive dye printing are relatively more environmentally friendly with less odor. Careful selection should be made for large-area hot stamping or low-quality offset printing products with exceptionally low prices.

4. Q: What are the key points to consider in the testing report provided by the merchant?

A: The confirmation report is issued by an institution with CMA (China Metrology Certification) qualification, and the report date is recent (such as within one year). The testing standards include national safety standards such as GB 18401, and the conclusion is "qualified" or all testing values are within the limit.

V. Summary

The odor of customized T-shirts is not necessarily a signal of "carcinogenic dyes", but more related to chemical residues in textile additives, printing processes, and other processes. Consumers do not need to panic excessively, but they should improve their discernment ability. Choosing brands or suppliers like Yasenman who are willing to disclose transparent testing information and focus on environmental management in the production process is one of the effective ways to avoid risks. Ultimately, promoting the overall improvement of the industry relies on consumers' continuous attention and rational questioning of product safety information. Putting safety and health first while pursuing individual expression is the long-term path to custom clothing culture.