A Diorshow Iconic Overcurl mascara, shade 090 Black. A Diorshow Iconic Overcurl mascara refill, shade 090 Black. How to Use: Apply the mascara vertically with the concave side of the brush. Boost and set the curl by pressing the brush against the upper lash line for an eyelashcurler effect. To refill the mascara, pull upward to remove the silver case. Insert the new refill into the silver tube to replace the empty container.