Two methods of changing an image from grey/gray scale back to color/colour using just one image.
Method #1 uses CSS filter:grayscale for Chrome, Safari and Opera, filter:gray; for IE6-9 and svg animate for Firefox. This gives a 1 second transition in Firefox, Chrome, Safari and Opera.
Method #2 uses svg with image and has a CSS change of filter on hover giving an instant change to color/colour but does work in IE10 and IE11.
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