| Non Conductive ?Quartz? type rock | Relatively Conductive Basalt? type rock |
|---|---|
 No air pressure, the spark dances all over the electrodes is in mostly orange/yellow, very little interaction with the rock. |
 No air pressure, the spark dances a bit over the electrodes is in mostly orange/yellow, already some interaction with the rock, tends to find a conductive path and glassify the rock. |
 medium air pressure, the spark dances all over the rock is in orange and blue, little interaction with the rock except to follow the contours threadlike dancing blue whisps. |
 medium air pressure, the spark dances all over the rock is mostly blue with some orange secondary sparkles off the surface., lots of interaction with the rock. |
 high air pressure, the spark settles into a blue line mostly straight along the rocks surface. more interaction with the rock, sometimes if the pressure of the air is high enough the arc will embed into the rock and heat up just a single thin line, melting the rock in that thin area only. |
 high air pressure, the spark settles into two blue spots where the electrodes tips are, most of the spark is inside the rock. almost all interaction with the rock and none with the air. Glassification is happening all along the arc which moves around as the glass is formed. very hot intensely bright molted bits can be seen 'modulating' near the electrodes and even in the rock as the glass forms and pushes the arc around. |
