How do I know if I can use liquid metal?

I wanted to ask which PC components I can use liquid metal. The problem is that you should not use it on aluminum. The question is, how do I know if it's aluminum?

For example, I have an old ASUS laptop (x53S), which I would like to use liquid metal, but I believe that the CPU and GPU edition of the heat pipe is aluminum, I have to consider.

Another example would be a RX570 Sapphire Nitro +, which I would also like to use.

I already tried to test the CPU and GPU surface with a magnet on the laptop, if they are magnetic. Both, however, are not magnetic as it seems.

Now the question, how do I know exactly, because I find little data about CPU and GPU (https://www.notebookcheck.com/Intel-Core-i5-2430M-Notebook-Prozessor.53434.0.html / https://www.notebookcheck.com/...16.0.html)

On the cpu you can use liquid metal (I think) without any problems.

Problem is that the parts from the headpipe are probably made of aluminum