We have hand mixed these Gouache Inks and they work with both Nib (tested on a Nikko G) and Brush (tested on a watercolour sable brush).
The ink is in a 15ml wide mouthed pot and as with a lot of pigment based inks they can settle so will need shaking or mixing before use. Water can be added to the ink to alter consistency as required and a little gum arabic can be added to thicken the ink. Our inks contain water so are best used on good quality paper (the paper used in the photos is cartridge paper).
If you have any questions about this product then please do not hesitate to contact us.