I can't believe I can say it! Two days ago I completed this project. It was starting to go too crazy because during several hours every day I was full focused on it. It invaded my mind so deeply it visited me during nights and dreams too.
These are the inks I'm using currently. There were chosen in order to match with my notebook style. After years I manage to use them properly and find myself confortable with these tones. My fountain pens love them.
However they are not waterproof and I wonder if I could find similar colors in waterproof brands. Soon I will post a video testing these ink with water. Horrible results.
One of the great points of keeping a notebook is the portability. I don't need a wardrobe full of writing tools, big easel or a studio. I can write in a terrace, in a mountain, in the bed and in the train. But nor under the rain.