EDIT: I'm thread-jacking this thing to let you know my article dropped over on the House of Paincakes: check it out.
I ended up having to experiment to recreate it, and luckily I ended up remembering it was a combination of washes in a specific order. Still, I'd already base-washed 3 models, so I'm hoping I can correct it without issue. WRITE YOUR RECIPE!
EDIT: The Master Manipulator (every store needs one) just mentioned in a comment that he keeps a small, black composition book next to his painting desk to write his recipes down in. I decided to edit this post and add that, since it's a great suggestion. I commonly keep a digital recorder handy to document ideas (stories, articles, Off Topical jokes - that kind of thing) but it never occurred to me to keep track of recipes with it. Worth a try though.
EDIT EDIT: It turns out Dethtron has already posted about his painting journal - obviously the Master Manipulator (every store needs one) is a big idea thief! Plus, the thinks I dip my models in poo.
|My Brotherhood Dreadnought, Bjorn the Claw-Handed. What can I say? I love the model, so Ebay'd it!|
|My mess. That's a Root Beer, the only real substitute for Shiner Bock before noon. No, I don't actually drink as much as I imply. I'm a beer a day dude, unless I'm on vacation.|
|My mess, again. I need to clean my station but that takes time away from painting.|
|Brotherhood models sharing space with Chaos Space Marines. Maybe they're sharing spikey bitz.|