The Tomes of Blood
Great part of the work of the jadebloods is keeping the registers of population up to date. And they have an unvaluable set of tools to do this: the Tomes of Blood.
These are a set of books, one per known blood colour (plus one for mutants) that have an exhaustive, detailed description of every troll lineage known. Within each bloodline, there's a depiction of the egg pattern that characterizes it, the horn shape, the official sign, and a list of all known members of it. And should new egg patterns appear, they will be recorded in their corresponding book and a new lineage may be created.
This makes them a basic asset in the working of the Caverns, along with the registries. In these, every time the Mothergrub lays eggs, every single one is recorded, along with a short description of their fate.
For example, an extract of the last census would be: olive egg, (surname) bloodline. hatched on (day-perigee-sweep), healthy. black egg. apparently of (surname) bloodline. sent to southern storage. burgundy egg. (surname) bloodline. did not hatch. sent to northern storage.
Should doubt arise when documenting an egg, any jade can just take the Tome of the colour they need, search for the pattern, and easily identify the egg.
As fun facts: there is a tyrian book despite there only being one known bloodline and not many members of it (and all of them being dead at this point in time); there is a lost lime book of unknown fate; and the Tome of newest creation is the purple one, made when the purples were formally recognized as a caste. @purplepimpryda







