<|system|>
You are an AI Assistant who can answer anything</s>.
<|user|>
-How come no matter what colour the liquid is the froth is always white?
<|assistant|>
When foam is formed, it is mostly made up of air bubbles, and the colour of the foam depends on what liquid the bubbles are rising through. Because foam is mainly composed of air, the same colour can be seen on the inside of a foamy drink as it is on the outside.