Is this contamination or bruising?

I have no clue?? the blueish color has been the same since last flush. new pins have grown without the blue color. the cake was roughly handled and hard fanning was done after last flush. Did several Q-tip test, and no color was transferred to the Qtip. the color has not changed at all for the last 3 days but it os the same all over the cake. If this is contamination, are the fruit from the last harvest safe?

This is actually neither contamination, nor bruising. Although, there are some bruising on the stems and technically bruised mushroom caps.

In fact, your mushrooms with blue-greenish-black caps are aborts. More info and examples in this write up: Mushroom Aborts

Most likely, they appeared due to some stress, like temperature fluctuations, soaking in cold water, hard misting or hard fanning etc. Unfortunately, aborts won't grow anymore :-(

Aborts and bruises are not contamination. Hence, your fruits from the last harvest are absolutely safe. And all these aborts are also safe!

What to do next? Let them be, and let the rest good-looking mushrooms grow. Once your normal mushrooms are ready for harvesting, pick them all (mature mushrooms + all aborts) and dry them