White wines change in colour as they age, too. Very often a young wine starts life with a pale green colour, which changes to light straw as the wine ages. After a while the colour can darken to a golden hue, and even, after a considerable time, to a light amber.
This all helps us to know that to expect when we taste a wine. If, for example, we open a bottle of very young wine and find it has an amber colour, we might suspect that it has been treated badly and has possibly oxidised form being left in the sun. a new wine with a pale greenish tint will probably be fresh and youthful in character. But don’t write off any wine purely on colour. Taste it first. It could be a treasure.