Out of a book devoted to curries, this was a straightforward mix of spices to make-your-own curry powder.
It was fun to do (ONCE!), and the powder is pretty authentic, though I would have liked it stronger. I don't remember the exact blend off-hand, but I remember the experience.
It involved roasting some of the spices, and then attacking them with a mortar and pestle till fine enough to go through a sieve. Then adding the non-roasted spices and mortar and pestle-ing them too. Then adding turmeric to colour the final result.
Really straightforward and simple, but HARD WORK. Grind grind. I have a new found respect for people who do these things from scratch themselves.
Quite honestly? I don't think the home made variety was any better than the pre-made stuff we get from the Indian supermarket in town. Sometimes going homemade is better. Not this time.
Don't bother. Just buy the bag of stuff from a decent Indian store and save your wrists. :)