(i) The heading area shall be yellow with the word "WARNING" and the alert symbol in black. (ii) The message area shall be white with black text. The message area shall be no less than 30 cm 2 (4. ...

There are around 50,000 chemical accidents in Swiss households annually that happen despite warning symbols displayed on products, experts say. This content was published on January 12, 2010 - 12:14 ...

The red background "conveyed a sense of warning, caution and danger." A yellow background had less impact, especially among younger children. And size didn't matter — at least, not much.