Remember to add each very slowly and to tint each clear liquid with some food coloring.

记住，每次添加的时候都要慢慢地，给每层液体略微着一些食用色素。

youdao

Liquid recycle formula is given through tentative study on electrochemical coloring technology on stainless steel.

对电化学不锈钢着色工艺进行试验研究，提出溶液再生调整公式。

youdao