Every batch of Clio we make is tested for color accuracy and striking consistency. To test the striking time, we make a small ball at the end of the rod to reset the color, hold it out of the flame for 60 seconds to allow it to cool, then put it back in the tip of the flame for 30 seconds to strike. Regular Clio will be a lovely cherry red at that point. Dark Clio is a batch of clio that turned cherry red while held outside of the flame for 60 seconds. This may mean that your working style will result in the nice cherry red or it may mean that your working style will over strike the Clio Dark and your result will be something more orange.