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So the Player's Guide says the following regarding the making of magical potions under the Alchemy Skill (pg.192);
"Creating an alchemical recipe takes a day's work. the character makes an Alchemy test against the appropriate Difficulty Number."

So where can the appropriate DNs be found? I have looked in the Player's Guide under Alchemy, in the Goods and Services section, and I have looked in the Gamemaster's Guide. Is this an errata, or am I missing it?

It's a result of layout/content changes in the books as development progressed. That information will be in the Companion, as part of the Enchanting chapter.

If you have the ED3 books, you can use those numbers for now. In the meantime, I'll see if (in the midst of everything else I'm juggling), I can get something put up.

Awesome! Good to know. Even more of a reason for me to be looking forward to the Companion.