Bleached rock and it turned black

[TopGun619]

Hello. So o was starting over my tNk and going bigger. I bleached my rock the first time and it cam out fine. This time it turned black and dark brown. Not sure if rock is ruined or maybe do another bleach cure. Or if the rocks are fine. We're in one tank for 2 years. Please help!! Posted two pic but have more that looks the same.

 

[taricha]

I assume "bleached" means you used bleach. I don't actually have a good idea if the discoloration darker tells you something concerning is present or not. I've never had any rock material come out with any color other than white.
Did the bleach smell bleach-y? I've had bottles of bleach that were very old lose almost all chlorinating power.
Personally, I'd give it one more session with a new bottle of bleach and see what happens.

 

[BeanAnimal]

I guess I don’t understand this new trend where people are bleaching, boiling and pressure washing rock. I think it is rather silly.