It does not matter if it is bright green, yellow, blue or orange paint, flow-vis has become almost the universal way for teams to assess aero parts.
However, Alpine raised a few eyebrows at last weekend's Italian Grand Prix when it appeared to roll back the clock and do something a bit more old-school with its aero testing.
Instead of using flow-vis to check on a revised low downforce Monza-specific beam wing, it fitted strips of yarn tufts across the rear of the new component, as well as the rear wing main plane (below).
Source: Autosport