Thanks, Charles, and here is my howto:
this is a varnish imprint again, I used thinned Pertex, cooled outside, to catch the flakes on a
microscope slide with a thin "paint film".
Pertex is a mounting media for microscopy, you can use nail varnish too....
It takes about 30 minutes before the thin film with the flakes will be dry.
I took the slides inside to evaporate the water of the melted snowflakes.
It is much more comfortable to take a closer look at the remaining imprints
with a warm microscope in a warm house...
For Illumination i used a setup similar to that one of Kenneth Libbrecht here :
http://www.its.caltech.edu/~atomic/snow ... photo2.htm
a combination of oblique lighting and Rheinberg illumination.
After shooting, i cut out the snow crystal in Photoshop to eliminate the thick
varnish outside the crystal shape. A little bit improvement in contrast and a new
background colour, that's it .....
Thanks for looking,
Gerd