I can't be a very good landlord, I can't fix anything myself (my wife reminds me of that frequently), and I probably shouldn't be the one negotiating the deal unless it's highly complex because I lack the key ingredient for success in real estate... which is patience!

The most essential ingredient to ask for is finding out their timing and motivation. 

Now if there was manufacturing going on..then testing for ingredients will get difficult.

Its hard to actually find someone willing to sell real estate at a big enough discount to create a big return for the investor( at least in my area) Its human nature  for the neophite to get frustrated and insecure that they are missing the magic ingredient but the truth is it really doesn't exist.

You get a cookbook with a recipe that looks good, discover a great fried chicken meal, and make your grocery list of ingredients to make a meal for your family.

While wood flour is a common ingredient of linoleum, it is only part of the recipe.  

Having 20% down, decent credit, and a lot of smart people around you is the ingredients to baking this cake.If you read the posts on here and get discouraged....don't!

These are different names for the active ingredients that actually convert malodors t their non odorous salt form.  

Greg also added a key ingredient... 

Meth precursors, those compounds that are the main ingredients in meth production, have also been heavily regulated in the past decade, making it very difficult to whip up a batch of your own.