Acid Test On Rocks/Slate

[need2ball]

So I've read about and performed the acid test on some slate that I want to put into my tanks. Instead of putting a drop on the slate, I dropped a piece of the slate into a jar of Muriatic Acid.

• Sample #1 fizzed, bubbled and sizzled like crazy.
• Sample #2 & #3 went in, and created some bubbles. It was more like you could see little bubbles forming on the bottom of the pieces of slate, combining into larger bubbles and then floating to the top.
• Sample #4 went in and it looked like I had just dropped it into a glass of water, absolutely nothing.

I know #1 is definitely a NO GO. I know #4 would be perfectly fine. What I don't know is about #2 and #3. What do these results mean? Are they okay to use?

 

[Oddball]

What tank setup are these rocks intended for? If it's an African tank, you want the rocks that sizzle in muriatic. A pic of the rocks would be of some help, too.

 

[need2ball]

I'll try to take pics of the slate tonight.

It is not for cichlids, it will be for plecos so I'm going for a neutral PH. Any ideas on samples 2 & 3?

 

[azmtns]

Muriatic acid will bubble and fizz just a bit on any dirty surface FYI. It could just be cleaning the rocks on number 2 and 3. Did you dilute the acid ? Or straight? If straight, I'm shocked 2 and 3 didn't do more then bubble. I think they should be fine for neutral ph tank.

 

[need2ball]

Thanks for the responses. Yea, I put them into straight Muriatic Acid, not diluted at all. Here are some pictures:

Sample 2 Front


Sample 2 Back


Sample 3 Front


Sample 3 Back

 

[pops]

the test you are speaking of is done with vinegar, few drops and if it does not react good to go. i would not put any stone I have dropped into muriatic acid in my tank.