Here is a goal: How to dye a pebble?

How would you accomplish this goal?

Available choices: --Clean the pebble, prepare a dye solution in vinegar and then heat the pebble in a skillet and let it sit in the dye for an hour; --Clean the pebble, prepare a dye solution in water and then heat the pebble in an oven and let it sit in the dye overnight;
Clean the pebble, prepare a dye solution in water and then heat the pebble in an oven and let it sit in the dye overnight