Mass tone : Colour of ink in bulk.

墨团色调：一团油墨的颜色。

youdao

With a blue mass-tone, representing the earth, the sea, the future dream, science and technology, etc.

以蓝色为主色调，代表着地球、梦想、海洋、未来、科技等元素。

youdao

By the time the FBU leader came to the end of his strike-tour of picket lines and mass rallies, his tone was notably more conciliatory.

BBC: Scent of possible compromise

Peter's Basilica, where they celebrated a Mass "for electing the Roman pontiff, " a ceremony that sets the tone for cardinals voting in the conclave.

WSJ: Black Smoke Signals No Pope Yet