Violet Line is the Hataka range intended for miniatures and figures. It is built around the shades that are hardest to mix by hand, rust above all: here it is broken into several steps from a dark shadow through the base tone to a light variant, ready to be layered straight from the bottle.
Strong colours such as a red-violet keyed to standard markings sit alongside them. How to use the rust steps on a model, and where rust belongs at all, follows below.
Rust is not one colour. On real metal you see a dark layer eaten into the material, a mid brown-orange tone and a light spot where the crust is flaking away. Painted in a single shade, such a surface reads as a brown stain. A range that offers shadow, base and highlight separately shortens the route, because there are no ratios to guess and the tones already sit together.
The method is then simple: darkest tone into recesses and around rivets, mid tone across the affected area, light tone only on small points in the middle. Three layers do more than an hour spent mixing one correct shade.
Water sits in seams, on lower edges, around rivets and wherever the finish has been rubbed through. Rust spread across an entire surface looks unconvincing. It helps to look at the model and ask where water would run and where it would linger longest.
Because the shades are already graded, nothing needs adjusting on the palette. Work from dark to light and let each layer dry. Fine modelling brushes are the tool for it. Apply the light tone sparingly, otherwise the whole area pales and the depth disappears.
Colours referencing standard markings suit more than figures: they serve on fittings and vehicles where you need one specific tone. Check the code against the instructions or your reference before buying and save yourself an argument with a colour chart.
Themed groups of shades from the same brand are in the Hataka paint sets category.