It looks like you're using an Ad Blocker.
Please white-list or disable AboveTopSecret.com in your ad-blocking tool.
Some features of ATS will be disabled while you continue to use an ad-blocker.
The crystals grow across the glass from tiny nuclei and surface imperfections. Unlike fern frost these crystals are small and quickly jostle others before they can get larger. The growth nuclei were either very close together or conditions rendered crystal nucleation and growth was rapid.
The secret of the magical colours is that he imaged the frost between two crossed polarising filters.
Ice is birefringent or double refracting. Placing a polarising filter each side of the crystals reveals the colours that result from interference between the two birefringent rays.
Colours are also produced by thin film interference. Distinguish between them by rotating the camera polariser. birefringent colours then change, those from thin films do not.