Im up to level 18 Scholar, and im still not dependant on other Tradeskills.
To scribe:
Papeterie Paper/ Coulin Paper thus far (sp may be off)
Sepia Ink/ Iron Gual Ink
Elm Quill / Maple Quill
Incense
Now, the only things I could use another tradeskill for is the quills and paper. You can buy the papeterie paper from the wholesaler for very little. The coulin papers, and quills can be made rather easy. Now, I've seen a few places that the only ingredient you need to be Pristine is the Primary. So, basically, you can make crude paper and quills and still get the App IV. I've not leveled woodworking or timbercraft at ALL, and make my own quills, ink and paper, and still have no need for another TS.
To make Essences:
Sepia Ink / Iron Gual Ink
Stroma Wash? Cant remember exactly, as im at work
Larent Suspension
Candle
Same as above, but the wash, suspension, and candles can all be bought from the wholesaler, the only thing you need to make is the ink, which we do anyway.
To make Runes:
Sepia Ink / Iron Gual Ink
Iron Spike
Electrum Ornament
Coal
This one I could see using another TS, but the spikes and ornaments can still be crude, so making them yourself is not completely out of the question.
So, in conclusion, the only reason I can see to use another TS is to save time, is this correct? Or am I just missing something?