Who is to say that this question isn't important? D&D is as much about imagination as it is about rules. Anyway, a lot of questions the sage answers could be figured out by players on their own. This one couldn't. Its a contradiction with no way of reading the intent of the designer.
The colour is irrelevant besides showing what utterly horrible editing the book went through. More important was the fact that one entry says it's too valuable to use in trade, the other says that it's a commodity. *sigh*