A wet-pigment study
Each drop grows over time through uneven, translucent pigment layers, with darker accumulation at its centre. The illustration includes paper fibres and fine pigment marks. It is a bounded visual simulation, not a physical fluid solver.
Water changes the result
More water makes a drop spread farther; less leaves a smaller, denser mark. Every drop remembers its own water setting. Changing the slider affects the next drop, allowing wet and dense marks to coexist on one sheet.
Place, observe and keep
The initial three drops are examples; fresh paper clears them. Tap to place a drop, or use arrows and Enter on the canvas. A page accepts up to 40 drops; fresh paper clears it. Reduced-motion settings show each drop at its final spread immediately. Diffusion stops progressing while the page is hidden, and reaches its final size after a minute of visible time.