They then dipped the gold into a solution containing the protein, allowing it to bind to the treated squares, and dunked the whole lot into a heated solution of iron salts.

再把这些金黄色的" 棋盘" 浸入含蛋白质的溶液中，并允许溶液中的蛋白质与棋盘上的固定蛋白质结合，最后把该" 棋盘" 全部浸入加热的铁盐溶液中。