A piece of paper, a pen and a transparent liquid, how to remind others that this liquid is toxic?

When I saw the quiz, I wanted to write a warning sign.

According to the content of the context, others are more supportive of the practice of X-type students, because this method is more creative.

Well, unlike my practice, I "refuted" the practice of "troublemakers" on a small scale, but I didn't refute the X-type students, I just "refuted" the practice of this exam.

The question in the test is: "How to remind others that this liquid is toxic?"

What can I do to let others know that this is a toxic liquid, not dirty and not drinkable?

Write warning signs: simple, clear and direct.

The "troublemaker" behavior of kneading paper into a ball or breaking a pencil and throwing it into a cup: it can only show that this cup of liquid is dirty and can't be drunk, but it can't show that it is a toxic liquid, and others don't know if this cup of liquid is toxic.

When someone sees this liquid and knows that he can't drink it, he may think it is an ordinary glass of water. He may reach into the cup, take out paper or pencil, and then pour water into the sink and flow into the sewer.

If this is a poisonous liquid, or it may be very corrosive, or the venom can penetrate into the skin, then when the hand touches this liquid, the skin will be hurt. Even if the hand touches the skin without damage, if this toxic liquid is poured into the sewer, it will cause secondary pollution to the water or soil in other places.

Dirty water doesn't allow people to handle this cup of liquid correctly.

The one who wrote the warning slogan can not only make people stop drinking this cup of liquid, but also make people handle it properly.