http://uwb25d43nnzerbozmtviwn7unn7ku226tpsjyhy5n4st5cf3d4mtflqd.onion/posts/tamper/index.html
The app Blink Comparison is ideal for this purpose. To protect an object from damage, e.g., by staining or by the substance leaking into, say, the ports of a laptop, it can be wrapped in cling film, a bag, or otherwise. Several colorful mixtures are described: red lentils & beluga lentils , yellow peas & white beans , etc.