Rig for Applying Fluorescent Dots

(A) View from the side – a mini airbrush held a chamber (c) of fluorescent paint solution that is ejected from the nozzle (n) as a fine mist by mixing with a stream of air (a) from an air compressor. The relative mix of air and paint is controlled by …

(A) View from the side – a mini airbrush held a chamber (c) of fluorescent paint solution that is ejected from the nozzle (n) as a fine mist by mixing with a stream of air (a) from an air compressor. The relative mix of air and paint is controlled by adjustment of the tail screw cap (t). This mist coated the cotyledon surface of a seedling (s) with fluorescent dots. The airbrush was held in place via a height adjustable stage control (co) connected with a heavy base and clamps.
(B) View from above – to control the amount of fluorescent paint that is sprayed upon the cotyledon surface the petri dish (p) containing the seedling was placed upon a model railway carriage (ca) that passed under the mist at a constant speed (red arrow) using a digital model train (not shown).

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