HOUSE OF AMAYAH™CROWN THEORY / CARE IN PRACTICE
Hair care touches mechanics, keratin biology, surface chemistry, water, geometry, friction and human routine. This is a working map of the literature we read to understand what hair has lived through and what care can responsibly do next.
A paper can give us a better question. It cannot, by itself, prove what a finished product will do. These entries name the source, explain what we take from it, and link to the record so you can read the evidence directly.
A new materials-science result argues that hair can exhibit spatial gradients in morphology, composition and mechanical behavior. For product R&D, the important implication is to avoid treating a strand as one uniform substrate from root to tip.
OPEN PRIMARY SOURCE ↗Micro-Raman work connects tensile loading with alpha-helix to beta-sheet transitions, disulfide changes and the role of water. It links molecular deformation to the macroscopic stress-strain response of human hair.
OPEN PRIMARY SOURCE ↗A hierarchical mechanics study reports strong dependence of tensile behavior on strain rate, relative humidity and temperature, reinforcing the need to control environmental conditions during hair testing.
OPEN PRIMARY SOURCE ↗Cross-sectional geometry, water swelling and mechanical behavior vary across sampled hair populations even when intimate fiber structures are broadly similar. Geometry is therefore a central variable in product and method design.
OPEN PRIMARY SOURCE ↗This review synthesizes how curvature, ellipticity, torsion and grooming loads interact. It is especially useful for separating ancestry labels from the mechanical consequences of fiber shape.
OPEN PRIMARY SOURCE ↗A cross-disciplinary systems view maps physical, mechanical, biochemical and geometric hair properties and emphasizes their interdependence rather than treating each metric in isolation.
OPEN PRIMARY SOURCE ↗A recent review centers friction as a major sensory and grooming variable, with weathering, 18-MEA loss, cuticle directionality and conditioning deposition all influencing tribology.
OPEN PRIMARY SOURCE ↗Atomic-force microscopy work directly associates the covalently bound 18-MEA surface layer with lower adhesion and friction, establishing a useful mechanistic target for surface-repair research.
OPEN PRIMARY SOURCE ↗Work on covalently linked fatty-acid mimics explores how a damaged hydrophobic surface might be restored. It is mechanistic evidence, not evidence for any House of Amayah finished formula.
OPEN PRIMARY SOURCE ↗This study separates internal and surface lipid behavior and uses microscopy and chemical analysis to investigate how washing and modification influence lipid retention.
OPEN PRIMARY SOURCE ↗Copper taken up from water can accelerate UV-linked oxidative damage in hair. Chelation strategies including EDDS and histidine were studied as ways to reduce copper uptake and downstream damage markers.
OPEN PRIMARY SOURCE ↗Proteomic evidence connects low levels of exogenous copper with increased UV damage, while chelation reduced copper accumulation in the tested system.
OPEN PRIMARY SOURCE ↗Multiple free-radical assays were used to study copper, antioxidants and chelators under UV exposure, providing a screening framework for oxidative-stress interventions.
OPEN PRIMARY SOURCE ↗Classic evidence shows that brief focal heating of damp hair can create internal bubbles and produce weak, brittle fibers. Water state and temperature must therefore be treated together in thermal protocols.
OPEN PRIMARY SOURCE ↗Long-hair analysis shows progressive weathering from the exterior inward, including cuticle abrasion and decline in surface-associated lipids such as 18-MEA along older lengths.
OPEN PRIMARY SOURCE ↗Geometry-first strand reconstruction and the Strands400 dataset show how computer vision can convert hair into measurable 3D structure, with future relevance to curl geometry, density and personalized routine modeling.
OPEN PRIMARY SOURCE ↗A strand-aware representation captures geometry and appearance for editing, relighting and animation. Beyond graphics, the work illustrates computational descriptors that could eventually support objective visual hair phenotyping.
OPEN PRIMARY SOURCE ↗Hybrid inverse rendering separates physically grounded light transport from residual appearance, useful conceptually for distinguishing true surface changes from lighting artifacts in imaging-based evaluation.
OPEN PRIMARY SOURCE ↗A 2026 pipeline combines reconstruction models, multimodal models and classical geometry processing to generate detailed strand geometry from single images, widening the toolkit for hair-shape digitization.
OPEN PRIMARY SOURCE ↗A continuum theory models hair bundles using bending elasticity, gravity, disorder and an equation of state. It is a reminder that bulk hairstyle behavior emerges from many interacting fibers, not only single-strand properties.
OPEN PRIMARY SOURCE ↗Before comparing routines, understand the starting point.
A sensory experience matters, but it should not carry the whole conclusion.
Immediate softness and durable change are different questions.
Ingredient evidence, prototype evidence and finished-formula evidence are distinct layers.
Researchers, cosmetic chemists, engineers, stylists and observant consumers can submit papers, datasets, testing methods or unresolved mechanisms. A useful observation can open a question; it is not an endorsement or a product claim.