Oh ketchup packet!
How to get the last sauce out?
Hydrocarbon films!
Waste from packaging where food products can’t be completely extracted builds up. Now research by Mukherjee et al (2018) suggests a solution might be at hand. The researchers found that hydrocarbon-based polymer films can be stably impregnated with vegetable oils. The resulting material is slippery and durable, ideal for the inside of packaging to reduce food sticking and waste.
Whilst this sounds high-tech the researchers were actually inspired by the pitcher plant which uses a slippery coating on its leaves to capture visiting insects.
Original research: http://dx.doi.org/10.1038/s41598-018-29823-7