Rembrandt was known for using a big iron mortar to mix most of his paints, but he took a more delicate approach to lapis lazuli because of its expense.

伦勃朗以使用大铁研钵来混合他的大部分颜料而闻名，但由于青金石的价格昂贵，他对青金石采取了更精致的方法。