The first picture was shot within seconds of breaking a piece of rock open. The second is another rock I broke after letting it stand for a few minutes. The third was rinsed and sat a while befor I took the picture. All of these rocks are a little over 5 years old.
Notice the dirty water in the lower picture. I used the stock tank for dunk, swish, scrub, dunk swish. They had been undergoing a series of experiments and "cooking" while awaiting their new tank setup.