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Water and fatty acids affect hair's surface differently based on hair damage, and models can help understand hair-cosmetic interactions.

The research found that twisting hair fibers can show changes in stiffness and damage, and help tell apart different hair treatments.

Hair thickening procedures can help people with early hair loss when combined with proper scalp and hair care.

Trichoscopy can help tell the difference between artificial hair fibers and other scalp artifacts.

Disulfide bonds affect the melting behavior of hair's crystalline structure, but hair retains some stability even after these bonds are broken.

Acidic sandy clay damages archaeological hair the most, while dry conditions preserve but make it brittle; silicone oil can help keep the hair flexible.

Hair fibers break by cuticle cell slipping, shape changing, cuticle fraying, and surface cracking when stretched under specific conditions.

A new method helps understand hair shine and various products improve hair care.

Hyaluronic acid in shampoo penetrated hair well, reduced frizz, and improved hair strength and moisture.

Hair coloring and bleaching can permanently break down hair protein and temporarily change its properties.

Hair curvature in Japanese people is linked to specific cell types and filament arrangements in the hair cortex.

Dye enters hair at the edges of cuticle cells and penetrates more from water than alcohol-based solutions.

Tooth papilla cells can help regenerate hair follicles and grow hair.

Researchers developed a new method to identify animal hair in textiles, which is effective for various fibers and more reliable than previous methods.

Light scatters differently from elliptical hair fibers than from circular ones, and a new model better predicts this behavior, especially for shiny highlights.

Adding human hair to sand improves its strength when dry and maintains strength when wet.

Adding human hair to clayey soil makes it stronger, even after freeze-thaw cycles, and is eco-friendly and cheap.

Merino wool fibers change shape with moisture, while human hair shape stays the same.

Anatolian native goat down-hair is similar to cashmere and can be used for high-quality textiles.

Repeated hair dyeing significantly damages hair.

Curly and straight hair differ in how their internal fibers are arranged.

Stretching-setting treatment works for wool and human hair using specific equipment and methods.

Permanent hair dye damages hair but it mostly recovers after 8 weeks; using certain hair care products can help repair it.

Thioglycolic acid and L-cysteine change hair structure differently during perms, affecting hair strength and curling efficiency.

Artificial hair fibers help treat scalp scars with few complications and a 20% yearly fiber fall rate.

The industry should promote pure luxury hair fibers, improve technology, and diversify products to support growers and ensure sustainable use.

Animal hair fibers like wool and mohair are strong when dry, but vicuna fibers are very brittle.

Small amounts of DNA can be found in the hair shaft, especially near the root, but it decreases with hair treatments and washing.

Using an enzyme and keratin treatment can significantly repair and strengthen damaged hair.

The research found a way to measure hair surface changes by analyzing how light reflects off of it, and determined hair cuticle angles vary by hair length and color.