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I am retired and decided last month to take up model railroading. I have been experimenting with rock molds and found that you can put a few drops of cement (concrete) coloring in your plaster of paris mix and make some convincing rock formations. The colors available at Home Depot are: terra cotta, red , buff and charcoal. The colors do not affect set time and you end up with a rock that is the same color all the way through. You can spray the casting with a darker color and then quickly wipe off the surface enhances depth perception because the darker color remains in the cracks a crevices after you wipe off the surfaces. The advantage to this approach is that you never see the white plaster casting even if you break the casting into pieces. <br /> On another subject, I bought a bag of kitty litter at Walmart last night and have size-graded into four mesh ranges . The largest can serve as talus, the lower middle as ballast, and the the smallest as powdered earth. The ballast size material is already the right color, but I plan to see if I can stain the smallest mesh with my Home depot concrete coloring. Since the stuff is supposed to be absorbent, it wiil probably suck up the stain like gangbusters! <br /> Bryant
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