Week 14 already, and a technique I use often. A mask is something that acts as a barrier to ink or paint or other colorants. You can make your own, buy them, even use found objects to create them.
A Tim Holtz mask has all the grunginess you'd expect, and for this challenge I used letters from the Ransom Alphabet mask to create the word "boo," and the Haunted mask for the spider webs. (there are two of them....I actually used one mask, then the other) Inks I used include black soot and spiced marmalade. There is also a bit of spray made with pumice stone reinker.
I broke out the Retro Halloween stamp set for the first time and stamped the skeleton and bat with embossing ink and covered it with black embossing powder (regular, not distress). After it cooled I inked over the images with mustard seed.
This tag is going to someone in a Halloween tag swap I'm in. Double duty again!