Select All and copy your pattern.
Make a Solid Color Fill Layer that's the colour of the board, beneath the layer that your pattern is on.
Make another Solid Color Fill Layer that's the colour of the ink, above the layer that your pattern is on, and set its blend mode to multiply.
In the layers palette, Alt-click on the mask icon for the ink layer.
Paste.
Image - Adjustments - Inverse.
Click back on the main icon for the ink layer.