But a color like blue, which was much harder to make -- many cultures didn't begin to learn how to make that color until much later.
اما رنگی مثل آبی، که ساختنش خیلی سخت‌تر بود بسیاری از تمدن‌ها خیلی بعدتر فهمیدن چطور اون رنگ رو خودشون بسازن.