Nail varnish impressions of stomata

The easiest way to 'see' stomata on a leaf is to take a nail varnish
impression of it. Paint about 1cm2 of the underside of the leaf with
transparent nail varnish. Allow to dry out thoroughly.[It takes about
30mins].Then peel off and place on a microscope slide. The stomata leave
clearly visible impressions in the nail varnish.If you use a graticule slide
you can count how many stomata are on the leaf. Other technicians report
equal success using a thin layer of PVA glue instead of varnish.

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