Abstract: The disclosure relates to an impact detection composite as well as related articles and methods. The impact detection composite incorporates a plasticizer and plurality of microcapsules into a polymeric matrix. The microcapsules serve as a means for detecting impact on the composite or a substrate to which it is attached. A sufficiently forceful impact can rupture the microcapsules and release an indicator therein. Presence of the plasticizer in the matrix facilitates diffusion of the indicator through the matrix once released. This allows for rapid detection of the indicator, for example as a visually observable color or color change at an external surface of the impact detection composite. The detectable change provides a tamper-proof and non-electronic means for detecting an impact. The impact detection composites can be incorporated into a variety of articles and used in a variety of settings, for example to monitor personal safety, to monitor article integrity, etc.