When discovered, this item appears to be a moderately ornate inkwell, filled with a silvery liquid. The inkwell itself appears only slightly valuable, and the liquid inside can easily be mistaken for quicksilver. Altogether, a merchant would pay perhaps 50 gold pieces for it.
If the silvery liquid is used as ink (any quill will do) whatever is written with it takes on magical properties which affect whoever reads them.
A statement of fact, however ridiculous it may be, will be believed. A command, even a command to kill oneself, will be followed. And a question, no matter how personal, will be answered. A successful saving throw against magic can be made to negate this effect. However, unlike many similar effects, a successful save will not alert the subject to the fact that someone has attempted to affect their mind, unless they are a magic user of 10th level or higher.
It should be noted that addressing a note with something to the effect of “To the King of Gorpagop” will cause whoever reads it to immediately stop reading it, and make every effort to deliver the note to the king of Gorpagop.
When found, the inkwell contains enough ink for 100 words.