I've never tried glycerine, with flowers, only foliage, so who knows? If you try it, tell us what happens.

In general, there is a lot of shrinkage with daisy-like flowers. The only one I've had even semi-success with is Anthemis tinctoris, dried on a hardware-cloth screen with the stem hanging through, and dried very quickly in a hot barn loft. I think they work because the ray and disc flowers are the same color.

Hi-The only way I get a nice-looking daisy is by drying them in silica. As Neil said, they do shrink a lot, so I only do the largest ones. HTH.

I find that they dry much better when you cut off the stems. Maybe because as long as they still have a stem, they still have access to liquid... I dunno. I just lay the flowers on a bed of silica.... carefully bury them (not letting the silica change the shape of the petals) and then when they're dry, I glue them back to the stems.