Tile Coasters

I have received some questions about my tile coasters, so I thought I would post the answers here!
This is how I make them...
I have used 3 types of tile for these, please learn from my mistakes.  Do not use any tile that has ANY type of a coating.  The first ones I used had some texture and didn't look glossy,so I thought I would try them, but they run, even after my stringent baking process.

My favorite are the 4x4 Chiaro tumbled marble from Lowes.  They are shrink wrapped in groups of 9 for 4.86.  These are natural tile and you may get some that are pretty pitted.  A moderate degree of pitting is ok and just adds to the effect IMO.   Lowe's won't take back singles, but if you get a lot and can come up with a group of 9 to return, they will exchange them for you (if you get deeply pitted ones you can't use.)

On to the crafting...
I wipe these down with a baby wipe and lay on a towel to dry.  When they are dry, I stamp my design with Stazon ink.  I think it's very important to bake after this step to set the ink so it doesn't run when you color.  I bake at 350 for 30 minutes.  (If you aren't going to add color, bake an extra 30 min, to really set the ink.)
Let cool.  This will take a while, these babies hold the heat.
Now you can add color.  I use colored sharpies to color them in.
*tip* yellow seems to bleed.
After they are colored, bake for another 30 minutes, and let cool in the oven.  I don't add any kind of  coating, like clear coat and they don't run.  IMHO a clear coat impedes the tile's ability to absorb the liquid, one of the reasons these coasters are so great!

When they are cool, I add cork to the bottom to keep them from scratching the table.  I get a roll of already sticky cork from Lowes for about $10 that does at least 12 sets of coasters.  you can also get the little sticky things you get to put on chair legs and put on all four corners.