Heidi/Story

After Myne sells the method of making black printing ink to the ink guild, Heidi wanted to immediately begin research into other colours. Her father, Bierce, stopped her since the sale was done using a magic contract and he was worried that Myne had sold coloured ink elsewhere with a different magic contract. Heidi then pestered her father until he agreed to set up a meeting to talk about coloured ink.

At the meeting, she was very eager to begin talking about ink and had to be restrained, along with Myne, until the talks were finished. Once an agreement was reached she immediately invited Myne to her workshop. There she began making coloured ink with Myne's instructions. The ink colour changed in unexpected ways and it seemed to be more dependent on the oil used rather than the powder added. However, with time and perseverance, enough colours were created to satisfy Myne.

Next was to test the ink on paper and layer the ink over each other. Initially the ink faded when applied to paper. Trombe paper was less affected. . When the ink was layered, it became very dark, almost black. This problem caused Heidi to lose sleep and sleep-walked into a paint workshop while thinking how they layered their colours but she did not find out the secret. Myne discussed the problem with her mother and found out about fixing agents and how they keep colours vibrant and allow them to be layered. However, this was from a dyer's perspective and Myne was worried about how the process would transfer. Myne later discussed fixing agents with Rosina who instructed her how to use fixing agents for printing.

Having found enough colours and how to print with them, Heidi's mood dropped as she thought she would no longer be allowed to continue her research. Myne, however, agreed to continue paying for research, but sets a limit; if they are ever late with an ink delivery then she would cut the funding.

Spoiler from Part 4 Volume 4

During Rozemyne's coma, Heidi diligently continued her research and managed to develop a varnish-like fixing agent that can be applied on top of ink to allow an additional lays of ink to be drawn or printed on top of that, without the two colours mixing.

When they meet Rozemyne again after her return from the Royal Academy, Heidi in her excitement forgets she's in the presence of nobility and behaves very inappropriate, leading to Josef harshly scolding her and mentioning that she is a mother now, much to Rozemyne's surprise and astonishment.

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