A dataset of 21 flash-lit videos of time-varying materials is acquired, by a simple-to-construct setup. The raw data in their original resolutions and formats (DNG photographs and Blender scenes). The data includes many natural phenomena: rusting, melting, drying, crystallizing, etc.The details of physical capture setup can be found in our paper, and some instructions to reproduce this dataset can be found in this repo.This dataset is released in the paper:Chen Liu and Tobias Ritschel. 2024. Neural Differential Appearance Equations. ACM Transactions on Graphics (Proceedings of SIGGRAPH Asia) (2024).