All right...this is much easier with props.
Consider a glass of water. Nothing in it, no ice cubes or rye or sand or anything. It has no hue. It's colourless. You can see right through it - everything on the otherside of the glass is visible, albeit distorted. It's clear.
Now consider a glass of chocolate milk. It's got a colour: brown. You can't see what's behind the glass. It's not clear, it's opaque.
There'll be a quiz on this later. Just be glad we no longer use the term "water-white".
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The first run through of any experimental procedure is to identify any potential errors by making them.
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