INVISIBLE INK

I bought a bottle of this high-quality (cobalt chloride) invisible ink from J. Herbin, a "maker of fine specialty inks." For the maiden voyage, I tried my best at Edgar Allen Poe's "Gold Bug" - in the story, an illustration of a species of scarab has an invisible ink skull drawn beneath it, the ink activated by heat.

SECRET HOBO SIGNS

The Internet has needed a good directory of old railyard hobo signs - the signs that hoboes used to chalk onto walls and trains to communicate with each other. Behold the Super Secret Clubhouse index of "Secret Hobo Signs". . .
[click to enlarge]

SECRET SOCIETY RINGS

Poland-based jewelry manufacturer AJS has an awesome selection of secret society rings for sale: the Knights Templar, the Masons, the Illuminati, the Knights of Columbus, etc. It appears that they are no longer selling from their website, but are selling their rings directly on eBay (LINK and LINK).
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TOOL LOCK-PICK CARD

The newest addition to the "Emergency Kit" in the trunk of my car: the Tool Lock-Pick Card.
Only $29.99 at the Maker Shed.

How to Pick a Lock

SECRET STASH

by Yiting Cheng.