Which is more suitable for collectors, black ink or gold ink?

Black ink is more suitable for collectors than gold ink. Gold ink is made of flowing gold powder, so it won't take long for the gold powder on the written works to fall off. The main component of black ink is carbon, which is chemically stable at normal temperature and pressure and is not easy to react with other substances. Therefore, black ink is more durable than gold ink, and what collectors value most is items that have been preserved for a long time. So black ink is more suitable for collectors.