Striking is a process where the glass is allowed to grow micro crystals that make the various colors depending on the size of the crystals and other factors. Physically it is allowing the object to cool, often to the point of no glow, and then reheating the object to the striking temperature. The reheating can be done in the flame or in the kiln. Flame striking is usually done by introducing the object into the far reaches of the flame briefly and sometimes repeatedly until the desired color develops. Kiln striking is done by raising the objects temperature to the striking temp in the kiln for various lengths of time (develops different colors over different times). The striking temp is usually in the 1080 - 1100 degF range plus or minus. you might have to experiment to see what temps produces the effect(s) you like. Some colors strike very easily and some require lots of manipulation to get good effects
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