Decoding the Experience: How We Measure Skincare Textures
When you pick up a skincare product, the way it feels on your skin isn't an accident. The "slip" of a serum, the "cushion" of a cream, and the "finish" it leaves behind are all meticulously engineered properties.
At Iduna, we believe in radical transparency. That doesn't just mean showing you our ingredient lists—it means explaining how we formulate. In the laboratory, we use advanced instruments and standardized descriptors to measure physical forces like viscosity, yield stress, and friction coefficients. But numbers alone don't tell you how a product will feel on a Tuesday morning when you're rushing out the door.
To bridge this gap, we've developed the Iduna Sensory Metrics System, a four-part guide featured on all of our product labels. This system translates exact, scientific formulation data into plain-spoken language, so you know exactly what to expect before you even open the bottle.
Here is what each metric means, and the science behind it.
1. Initial Touch
What it means: How the product feels the exact moment you dispense it and touch it with your fingertips. Is it a dense, rich cream, or a water-light liquid? The Science: In the lab, this measures Yield Stress and Low-Shear Viscosity. Yield stress is the amount of force required to make a product start flowing. A thick balm has a high yield stress (it stays put until you rub it), while a watery essence has almost zero yield stress (it flows immediately). We use this metric to ensure the product has the perfect "cushion" so it doesn't run through your fingers or feel overly heavy.
2. Application
What it means: The experience of spreading the product across your face. We measure how much effort is required to spread it and how quickly it absorbs into your skin. The Science: This correlates to the Shear-Thinning Index and Hydrodynamic Lubrication. "Shear-thinning" describes how a product becomes thinner and more spreadable the more you rub it. We engineer our formulations to have an elegant shear-thinning profile so they glide effortlessly without dragging on delicate skin. The "absorption rate" measures how many strokes it takes for the product to transition from a wet liquid to an invisible film.
3. Visual Finish
What it means: How your skin looks immediately after the product has set. Does it leave a dewy glow, or a clean, matte appearance? The Science: We evaluate Optical Density and Surface Gloss Angle. We formulate to control how light reflects off the thin film left on your stratum corneum (the outermost layer of skin). For our morning products, we often design for a smooth, matte-to-natural finish that plays nicely under makeup or sunscreen. For overnight recovery creams, we lean towards a dewy, highly reflective finish that locks in moisture.
4. After-Feel
What it means: The lingering sensation on your skin minutes to hours after application. It tells you whether the product feels breathable and weightless or deeply occlusive and moisturizing. The Science: This metric captures the Boundary Friction Regime and Transepidermal Water Loss (TEWL) prevention. It defines the physical barrier the product creates. A "breathable" after-feel means the product has absorbed fully with low boundary friction (no stickiness). A "deep moisture" after-feel indicates the presence of larger occlusive molecules designed to trap water in the skin, which naturally leaves a more tangible, protective layer.
Why This Matters
We don't want you to guess what a product feels like. By putting these metrics directly on our labels, you can curate a routine that not only addresses your skin's clinical needs but also matches your exact textural preferences.
Whether you prefer the rapid-absorb, water-light feel of our Angel Tears AM Serum or the cushioned, deeply protective wrap of our heavier creams, the science of texture is now in your hands.