Is Nail Polish allowed in luggages in China airport? Is there a limit to the amount of liquid you can place in your luggage?

Okay to be clear, I went to China a few months back and leaving the country to head to my home country, I was stopped at the airport where we were placing our luggage to be placed in the airplane (not carry on). The machine that brought our luggage inside the airplane lighted red as if it had been alarmed or something. The woman asked me if I had Acetone in my luggage. I couldn't quite understand her because of her accent so she just told me to open my luggage. She pointed at my Nail Polish. I was so scared. After seeing the Nail Polish she let me move along and place the nail polish back in my bag. Could the nail polish have triggered the system? How can I be sure that this doesn't happen again per say I go back to China? Also, is there a limit to the amount of liquid you can place in your larger luggage? Like lotions? Does that count?

Added (1). Oh, and I don't travel a lot that's why I don't have much clue.

Nail polish is fine.

The machine that brought our luggage inside the airplane lighted red as if it had been alarmed or something.
YOU DO NOT KNOW. You guess a reason.

The woman asked me if I had Acetone in my luggage. CLEAR QUESTION. YOU ANSWER either YES or NO if not sure you say I DO NOT KNOW.

she just told me to open my luggage. YOU DO IT.

Could the nail polish have triggered the system? YES

How can I be sure that this doesn't happen again per say I go back to China? SERIOUSLY LEAVE IT AT HOME is a simple answer.

is there a limit to the amount of liquid you can place in your larger luggage? NO
Be aware liquid is heavy about 1KG per litre. The weight counts.

It does matter what the liquid might be. Do you need a list of stuff not to take in your luggage?

Chlorine for Pools and Spas

Flammable Liquid, Gel, or Aerosol Paint
Do I really need to continue.
It is your choice to have a fast pass at the security check or a long one by what you decide to pack in your luggage.
If security questions your stuff they can exclude anything they want including you.
YOU MAKE UP YOUR MIND.
Do you want to check in with NORMAL stuff and pass easily or do you wish to push the buttons of security and have a long chat as they investigate each item?
Nail polish is allowed. Looking like a sales representative and having a suitcase full is a customs issue not a security issue.

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