Wow. I just read this whole thread and I have to say the start of it really had some hackles up and feathers flying and I just do not understand why. Allow me to explain the way I see it.
First up, good ole mate Abdul gives us a real simple "8 Spice" recipe for a mix powder. Pretty simple, yeah?
BUT NO. It all goes pear-shaped from there at the start and for no good reason. All that BS over the use of Tandoori Powder. Let's have a good look at this from a very novice standpoint.
Number 1 ingredient is 100g of Mild Madras Curry Powder. WHICH ONE? 3 sites give 3 different recipes with anywhere from 7 -10 ingredients out of a list of 13. Some powders, some whole, some roasted, others not, some added in together, others separately at the end.
Further down we find Garam Masala. WHICH ONE? A quick look at the first 3 on Chef Google found 3 different recipes and one in particular was very different to the other two. Again all using multiple ingredients from a list of many, with some, but not all, common to all 3 and in varying proportion.
Now the ingredient that caused the stir. Tandoori Powder. WHICH BLEEDING ONE??? Again a quick search of different sites will give you the same situation as described above. So many variations of different quantities of spices from a long list and each one is different.
Then you have the fact that all 3 compound ingredients, ie Mild Madras, GM and Tandoori Powder, may also (actually do) contain some ingredients in common and which are also found as single spice ingredients in Abdul's original recipe list.
SO here is the thing, see. Making Abdul's Mix, from his recipe in the OP of this thread, is capable of producing hundreds, or even thousands, of either slightly or very different ACTUAL MIXES. Yours wont be the same as mine or Abdul's. The actual inclusion of Tandoori Powder is far less influential on the end product than the variation of spices in the 3 composite ingredients listed.
By the way, calling it an 8 Spice mix is not quite right. 8 ingredient mix, yes, but it will have more than 8 actual single spices. This thread has basically given me pause to reconsider asking the question I was intending to ask originally in the Curry Powder thread. I'll have a think about it and do some more of my own research then ask later.
Tell me if I've got it all wrong but in my Novice mind, that's how I see it.