My Little Experiment

Two of my students were absent today. Thus, there was a long one and a half hr of break. While waiting for the next one to come, I decided to conduct a small experiment to find out how long apple can maintain its natural white colour after being cut. Mum was kind to donate 2 of her apples (green and red). However, not long after she saw me cutting her apples into very thin slices, she started to nag. To her, it is a waste to use the whole apple for such childishness. Her experience tells us that the sliced-apple if soaked in salt-water can last for ~ 4 hr before it changes colour. But my main concerns are: how long could the sliced-apple maintain its colour in X solution; and how tasty it is or can be.

Is my experiment successful? My guinea pigs will have their answer on Friday.