To reach this kind of image, I used an electronic device to control the water drops and the flash to freeze. This is an dedicated gadget, and the camera was set to f8 and 2 sec. I shot the camera and start the device, that drop, drop again and trigger the flash. The colision , was not casual. No PS envolved to change colors. The full splash series can be seen at http://luxvich.atspace.com/