Hardness Test Result of 28mm Cube Coconut Shisha Charcoal April 18, 2020July 14, 2020 Export Coenergie0 commentsUncategorized Ash (Visual) : Thin; Color : GrayHardness drops:3 drops : 1 cube shattered5 drops : 3 cubes shattered6 drops : 3 cubes shattered7 drops : 1 cube shattered9 drops : 1 cube shattered11 drops : 1 cube shattered(recorded on 17th April 2020)