Finally, we deal with the process by which spells are placed upon scrolls. Most details on scroll inscription are given in the 1st Edition DMG, page 117. An unused quill is needed to write a spell onto a scroll. The quill must be from some feathered creature of a magical nature, such as a griffon, roc, harpy, sphinx, pegasus, hippogriff, kenku, or diakk. These quills cost 25-100 gp or more
depending upon local availability. Ink is also required; the magic-user must either buy the ink premade (if it is available) or find the formula of ingredients and the process to produce the ink himself. Each spell has its own ink formula. DMs should feel free to invent their own list of ingredients and the process by which the ink is produced (use your imagination, and see the 1st Edition DMG, page 117, for an example). The ink should cost 4-40 gp per spell level to manufacture and 2-200 gp per spell level to purchase premade. To manufacture the ink, the magic-user needs the assistance of an alchemist, who must also be paid for his help. [The 2nd Edition game does not give prices for these required items; PCs must get them personally or hire someone to get them. Also, alchemists are not required for the making of spell ink, as mages can create the ink themselves.]
To begin, the magic-user must have all the materials necessary for scroll-making at hand: ink, quill, the material components of the spell to be inscribed, and the scroll itself. The magic-user must select the type of surface upon which the spell is to be transcribed (see the Inscription Surfaces Table). With all the necessary materials at hand, the magic-user can prepare for spell transcription. The preparation period costs 100 gp per spell level and lasts one day per spell level. This period is spent in meditation, fasting, drawing magical runes and symbols, readying the ink, etc. When the preparation period ends, the magic-user is now ready to cast the spell and transcribe it from his spell book and memory onto the scroll. This process takes one hour per spell level. During the spells transcription period, the magic-user enters a trancelike state. Any interruption of his concentration automatically results in the failure of the transcription. To determine if the scroll inscription is successful (provided no interruptions are experienced), see the section on scroll-inscription failure on page 117 of the 1st Edition DMG.
Dragon Magazine 147, p34-35
* this section will be updated.