High-resolution scientific talking-head video,
fixed camera, locked framing, upper body visible,
no camera movement,
professional laboratory lighting optimized for short-video platforms,
global brightness intentionally elevated,
facial skin exposure locked as absolute priority,
no overexposure, no clipped whites,
highlights preserved on face and lab surfaces,
full laboratory environment visible and clear,
background brightness capped below facial exposure,
no blown highlights anywhere in frame,
female researcher @liuyan7,
wearing white lab coat and white shirt,
clean, professional, scientific appearance,
facial skin in ideal healthy condition,
skin smooth, elastic, hydrated, refined,
fine lines visually softened by lighting,
no emphasized wrinkles,
complexion corrected to remove yellow or gray cast,
fair skin with healthy pink undertone,
white-and-pink clarity, translucent and bright,
skin looks clean, even, and youthful,
natural skin only, no makeup, no lipstick, no blush,
skin quality achieved by lighting and exposure only,
no beauty filter, no artificial smoothing,
image sharp, high micro-contrast,
facial details clear even after platform compression,
no blur, no haze,
@liuyan7 抬头讲解：“我在项目里看到，更常见的诱因，是体系里残留的微量铁铜离子，在储存过程中催化了氧化反应，颜色提前变化。在工程上常见的控制思路包括：通过EDTA2钠 做离子 熬合，控制在百分之0.05-0.1；
@liuyan7 戴着手套操作移液器，向溶液中加入EDTA-2Na溶液，动作精准。镜头特写实验台上的标签：0.05–0.1% EDTA-2Na。
语速急促