k3d/share/shaders/k3d_grids.sl:18:color G1L1_GridColor=color(0,0,0); 
k3d/share/shaders/k3d_grids.sl:66:color G1L1_Ct = blend(G1L1_SurfaceColor, G1L1_GridColor, G1L1_layer_opac);
