Grand Duke Iron Blood was not disappointed with the information he had paid for with a dragon. The shipping manifest allowed the Grand Duke to have his mages calculate and determine what was the kind of ship the Devil's Horn was trying to build, and what attributes the ship would have.
Imposa was a master alchemist and was superior to Saleen.
The Grand Duke and Saleen moved to the true trade that they had set up the meeting for afterwards. Dragon Island had lots of materials that Saleen required, such as dragon bones and fresh dragon blood.
Dragon Blood Ink was not truly made of dragon blood but concocted by mages using herbs. If scrolls were made using real dragon blood, they would be at their most powerful. The scrolls could even carry dragon tongue magic.