Spell from 101 zero level spells what inks would be reasonable?

[Senko]

I tend to play characters who go through a lot of ink (journals, spells, drawing pictures) and I noticed this spell in 101 zero level spells from Rite publishing. It doesn't go into much detail and I'm wondering what kinds of inks would be reasonable with it (spell at bottom). I'm leaning towards non-magical, non-special inks myself. That is the quill can produce any coloured ink you wish (black, blue, green, gold, etc) but not special inks (phosphorescent) or more than one type of colour (silver with gold flecks) at time. I'm also thinking that the inks can't be used for magical purposes e.g. you can write a a journal entry or draw a multi-coloured picture (blue sky, green leaves on a tree, etc) but you can't use it to scribe a scroll or copy something into a spell book. What do people think? Would this be reasonable for the spell, should it be able to do any ink (phosphorescent, scribe into a spell book) or should it be more restricted only black ink?

Quill
School conjuration (creation); Level bard 0, sorcerer/wizard 0
Casting Time 1 standard action
Components V, S
Range personal
Target self
Duration 10 minutes/level

This spell conjures a perfectly formed quill pen, usually pure white. The conjured quill has a soft glow. The quill does not need ink; it creates its own as needed. The quill vanishes if it leaves the caster’s hand.

[Pizza Lord]

Your ruling or restriction would be reasonable. It's also reasonable that (in interest of word count and space limitations) the original author clearly intends it to be 'normal' ink, as typically thought of. Meaning, black writing ink only, not colored or of any specific type. It doesn't make any indication of doing anything or creating artwork of colors at all. It seems quick narrow and probably should be read as 'just normal, ordinary, black ink'. Nothing stops the caster from using the quill with any other, actual ink that they have, such as magical inks for scribing spells into spellbooks or scrolls. But it should only create ordinary ink.

[Azothath]

ink
as noted lampblack is a byproduct of burning coal and organic biomass and has historically been used to make ink, so just very fine carbon powder. Besides water and possibly a light hydrocarbon/alcohol as a solute, an emulsifier/binder(glue) is added. So black ink is extremely cheap to make and carbon stays black (fade resistant).
Other simple inks are salts(usually metal salts) complexed with a weak acid. Eggs provide an great emulsifier and binder.

while I don't design spells in Advice forum, most zero spells have a duration of an hour. Arcane Mark last longer but it conveys less information.
Scrivener's Chant:T0

[Senko]

Azothath wrote:

ink

as noted lampblack is a byproduct of burning coal and organic biomass and has historically been used to make ink, so just very fine carbon powder. Besides water and possibly a light hydrocarbon/alcohol as a solute, an emulsifier/binder(glue) is added. So black ink is extremely cheap to make and carbon stays black (fade resistant).
Other simple inks are salts(usually metal salts) complexed with a weak acid. Eggs provide an great emulsifier and binder.

while I don't design spells in Advice forum, most zero spells have a duration of an hour. Arcane Mark last longer but it conveys less information.
Scrivener's Chant:T0

Interesting but I'm not designing this spell it exists in a third party suppliment I'm just asking for advice on how best to interpret its just saying "ink" not "black ink" or "normal ink" when there are special inks needed for scribing spells or that glow in the dark.

[Azothath]

unless specified there is ink for writing(see equipment), then "Materials and Costs: The cost for writing a new spell into a spellbook depends on...(Table)", and then there are specialty inks that appear as equipment with basic descriptions. Scribe Scroll creation feat talks about general cost and quality of materials not specifics.
That's as much detail as the game goes into.

Ink description wrote:

This vial contains 1 ounce of ink. Ink in colors other than black costs twice as much.

As a GM it is your job to fill in those details if you desire depending upon your game and the level of details your players want.

All the descriptions and prices are there as guidelines when you get creative. It's fine if you vary a gold or two as past third level it's not going to mean much.

Personally as Spellbooks aren't magical I'd eliminate the cost of writing regular spells into a spellbook unless the character wants to illuminate the book or do something fancy. Books do retain value for their information and as objects of art and/or history (ahhh Provenance!). How you model that is more a matter of taste and judgement. Spellbooks have value as wizards want them to expand their repertoire.
If you want to go into details I'd suggest requiring colloidal silver with some blood of the caster as the standard ink for penning spells and then make spellbooks faintly magical. You'll also have to designate some optional inks for scribing (india ink with cockatrice yolk, pomegranate juice mixed with suspended ground & baked dragon bone, etc).