What is Shine (Aurora) on Fabrics, and Which Fibers are Prone to it?

by Elizabeth / Sunday, 09 February 2025 / Published in Textile Knowledge

Shine, sometimes referred to as “aurora” in the context of fabric defects, is a phenomenon where fabric exhibits an undesirable glossy or shiny appearance. This isn’t the beautiful natural light display of the Earth’s poles, but rather an indication of wear, damage, or improper care that can make clothing look soiled or worn. It’s essentially a fabric defect that detracts from the garment’s overall appearance. This article explores the causes of fabric shine and which types of fabrics are most susceptible to this issue.

1. The Mechanics of Fabric Shine

Fabric shine occurs due to changes in the surface structure of the fibers. These changes cause the fibers to reflect light in a more uniform and concentrated manner, leading to the undesired glossy appearance. Common causes include:

Friction: Repeated rubbing during wear or washing can abrade the surface of the fibers, smoothing them down and increasing their reflectivity.
Pressing/Ironing: Excessive pressure or heat during ironing can flatten the fibers, especially those that are heat-sensitive, leading to shine. In some cases, this can even cause slight melting.
Abrasion: Contact with rough surfaces can damage or alter the fabric’s surface structure.

2. Wool Fabrics and Shine: The Loss of Scales

Wool fibers possess a scaly outer layer. These scales, when intact, create a matte surface that diffuses light. However, friction and heat can damage and dislodge these scales, exposing the smoother inner fiber. This smoother surface reflects more light, resulting in shine.

3. Synthetic Fabrics and Shine: Melting and Fiber Damage

Synthetic fibers, like polyester, are thermoplastic, meaning they soften and melt under heat. Excessive ironing or high dryer temperatures can cause these fibers to flatten or slightly melt, creating a smooth, reflective surface. Using a hot iron without testing the temperature can almost certainly produce shine, especially with older irons that may have wider temperature swings.

4. Fabrics Prone to Shine

The fabrics most prone to developing shine are those that are susceptible to fiber damage from friction, heat, or abrasion. These include:

Wool: As discussed earlier, the scales on wool fibers are easily damaged.
Polyester: High heat and excessive abrasion are major contributors to shine.
Wool/Polyester Blends: These blends combine the susceptibility of both wool and polyester.

These fabrics, especially those used in tailored garments like suits, are common culprits of undesirable shine.

5. Practical Tips for Preventing Shine

Preventing fabric shine involves careful handling and cleaning techniques. Here are some recommendations:

Gentle Washing: Use a mild detergent and a gentle wash cycle. Avoid harsh scrubbing.
Low Heat Drying: Tumble dry on low heat or hang to dry.
Proper Ironing: Use a low to medium heat setting. Always use a pressing cloth between the iron and the fabric. Turning the garment inside out is also an excellent idea.
Avoid Over-Pressing: Only iron when necessary and avoid pressing the same area repeatedly.
Professional Cleaning: For delicate fabrics, consider professional dry cleaning.
Storage: Store garments properly to avoid unnecessary friction and abrasion.

6. Troubleshooting Shine on Suits

Suits, particularly those made from wool or wool blends, are often prone to shine. Here’s a table summarizing prevention and corrective actions:

Problem	Cause	Prevention	Corrective Action (Limited)
General Shine	Friction, heat, abrasion	Gentle washing, low heat drying, pressing cloth, avoid over-pressing	Professional cleaning may slightly improve appearance.
Ironing-Related Shine	Excessive heat during ironing	Use low/med heat, pressing cloth, test temperature first, iron inside out	Steaming may help lift slightly flattened fibers.
Wool Fiber Damage	Loss of wool scales due to friction	Gentle washing, professional cleaning, avoid excessive wear in high-friction areas	None. Once the scales are gone, the damage is often irreversible.
Polyester Melting	High heat during ironing or drying	Use low heat, pressing cloth, hang to dry	Irreversible. The melted fibers cannot be restored.

By understanding the causes of fabric shine and implementing preventive measures, you can extend the life of your garments and maintain their original appearance. Shine, while often perceived as a minor issue, can significantly impact the overall look and feel of clothing. The type of fabric plays a key role, so the washing and ironing methods should be adjusted to the specific fabric.