Old Russian documents. What language were written in
Old Russian language originated from Old Slavonic in the XII century. Old Slavonic covers the period of IX-X centuries. The main arches are Bulgarian, Serbian and Russian. We can say the adaptation of Old Slavic by region.
On what did these very documents write. Media
Parchment is the earliest material in Russia, not counting the birch bark of stone and plank, which were used before and after, but not for office work.
Europe began to actively use paper from the XI-XII century, it was at this time in Russia, paperwork began to be conducted on parchment. Paper came to us only in the 15th century, and at the same time began to use half-seal and cursive writing, but following the Bulgarian model when the Turks conquered the Balkans and Bulgaria, at that time contributed to the influx of southern Slavs into Russia, and they brought their spelling and types of writing.
Until the 15th century, only a charter was used in Russia that was read for chant, so there were no punctuation marks, but there were signs of intonation.
What did the documents write
Until the middle of the XIX century they wrote with goose feathers sharpened and split at the end. Office books were most often stored in columns. Columns are 15-17 centimeters wide, and up to half a meter long, if you lift such a column from one edge beyond the last leaf, then the column turns into a zigzag.
Under Peter I, all documents were stored in notebooks for better preservation, but in fact, notebooks were used before Peter I, but simply less often and basically they were either copies from columns or books for more convenient use.
It’s good that now it is much easier and more reliable to store information and record it.
Good luck in finding.