In order to know the authenticity and value of these potion formulas, William made use of a great amount of connections, and finally found a pharmaceutics Master from the Pharmacist Guild. With the discernment of that pharmaceutics Master, William's guess was confirmed. These potion formulas were indeed from the Dark Age, and differed from any known formulas from the Pharmacist Guild.
William couldn't contain his excitement upon obtaining this knowledge. He felt like he had picked up a gem, which hadn't happened to him for a long time.
However, what that pharmaceutics Master said next dampened William's enthusiasm like a bucket of cold water. "The formulas are probably authentic, but they involve a few concoction techniques that were lost in time. Even I can't make the potions successfully by following these formulas," the pharmaceutics Master told him candidly.