DIY Rock

[mutiger91]

Is there a reef safe dye i could use when making this stuff to color it purple?

 

[Scrubber_steve]

I don't know if there's a better way than letting coralline algae do the colouring for you, the natural way, but resin mixed with marble dust & resin pigment for coloring is one other way.

 

[Michael Hoaster]

I'm curious about your reasons for wanting to do this. Can you explain?