I REALY CLEAN MY PETRIFIED WOOD I PUT IN THE OVEN AT 450 GET IT REAL HOT TAKE IT OUT AND SPRAY IT WITH A SEM GLOSS POLYURETHAHE IT BRING ALLTHE COLOR OUTI really like the petrified wood. I find tons of petrified wood pieces while bottle hunting in a couple local creeks so now I have a box full. Yours look shiny, what did you coat them with?
THANK YOU HARRYIt is not a problem with these scraps of pet wood, but it is a mistake to use polyurethane on other, possible significant, fossils. There are plastic consolidants, like Butvar B-76, which work better for your purpose, and are reversible (unlike polyurethane).