diff --git a/includes/powder.h b/includes/powder.h
index 6efee3ada..9c7f952ba 100644
--- a/includes/powder.h
+++ b/includes/powder.h
@@ -391,7 +391,7 @@ static const part_type ptypes[PT_NUM] =
     {"BIZR",	PIXPACK(0x00FF77),	0.6f,	0.01f * CFDS,	0.98f,	0.95f,	0.0f,	0.1f,	0.00f,	0.000f	* CFDS,	2,	0,		0,	0,	20,	1,	30,		SC_LIQUID,		R_TEMP+0.0f	+273.15f,	29,		"Bizarre... contradicts the normal state changes.", TYPE_LIQUID, NULL},
     {"BIZG",	PIXPACK(0x00FFBB),	1.0f,	0.01f * CFDS,	0.99f,	0.30f,	-0.1f,	0.0f,	2.75f,	0.000f	* CFDS,	0,	0,		0,	0,	1,	1,	1,		SC_CRACKER2,	R_TEMP-200.0f+273.15f,	42,		"Bizarre gas", TYPE_GAS, NULL},
     {"BIZS",	PIXPACK(0x00E455),	0.0f,	0.00f * CFDS,	0.90f,	0.00f,	0.0f,	0.0f,	0.00f,	0.000f	* CFDS,	0,	0,		0,	1,	1,	1,	100,	SC_CRACKER2,	R_TEMP+300.0f+273.15f,	251,	"Bizarre solid", TYPE_SOLID, NULL},    
-    {"INST",	PIXPACK(0x404039),	0.0f,	0.00f * CFDS,	0.90f,	0.00f,	0.0f,	0.0f,	0.00f,	0.000f	* CFDS,	0,	0,		0,	1,	1,	1,	100,	SC_CRACKER2,	R_TEMP+0.0f	+273.15f,	251,	"Instantly conducts, like walls, is now also a battery, PSCN to charge, NSCN to take.", TYPE_SOLID|PROP_CONDUCTS, NULL},
+    {"INST",	PIXPACK(0x404039),	0.0f,	0.00f * CFDS,	0.90f,	0.00f,	0.0f,	0.0f,	0.00f,	0.000f	* CFDS,	0,	0,		0,	1,	1,	1,	100,	SC_ELEC,		R_TEMP+0.0f	+273.15f,	251,	"Instantly conducts, PSCN to charge, NSCN to take.", TYPE_SOLID|PROP_CONDUCTS, NULL},
     {"ISOZ",	PIXPACK(0xAA30D0),	0.6f,	0.01f * CFDS,	0.98f,	0.95f,	0.0f,	0.1f,	0.00f,	0.000f	* CFDS,	2,	0,		0,	0,	20,	1,	24,		SC_NUCLEAR,		R_TEMP-2.0f	+273.15f,	29,		"Radioactive liquid", TYPE_LIQUID|PROP_NEUTPENETRATE, NULL},    
     {"ISZS",	PIXPACK(0x662089),	0.0f,	0.00f * CFDS,	0.90f,	0.00f,	0.0f,	0.0f,	0.00f,	-0.0007f* CFDS,	0,	0,		0,	1,	1,	1,	100,	SC_NUCLEAR,		140.00f,				251,	"Solid form of ISOZ, slowly decays.", TYPE_SOLID, NULL},  
     {"PRTI",	PIXPACK(0xEB5917),	0.0f,	0.00f * CFDS,	0.90f,	0.00f,	0.0f,	0.0f,	0.00f,	-0.005f	* CFDS,	0,	0,		0,	0,	0,	1,	100,	SC_NUCLEAR,		R_TEMP+0.0f	+273.15f,	40,		"Portal IN.  Things go in here", TYPE_SOLID, NULL},
diff --git a/src/powder.c b/src/powder.c
index a515177d5..cbb2ab27d 100644
--- a/src/powder.c
+++ b/src/powder.c
@@ -2097,6 +2097,7 @@ void update_particles_i(pixel *vid, int start, int inc)
                                 continue;
 							if((r&0xFF)==PT_SPRK){
 								int destroy = (parts[r>>8].ctype==PT_PSCN)?1:0;
+								int nostop = (parts[r>>8].ctype==PT_INST)?1:0;
 								for (docontinue = 1, nxx = 0, nyy = 0, nxi = nx*-1, nyi = ny*-1; docontinue; nyy+=nyi, nxx+=nxi) {
 									if(!(x+nxi+nxx<XRES && y+nyi+nyy<YRES && x+nxi+nxx >= 0 && y+nyi+nyy >= 0)){
 										break;
@@ -2132,7 +2133,11 @@ void update_particles_i(pixel *vid, int start, int inc)
 												if(nyy!=0 || nxx!=0){
 													create_part(-1, x+nxi+nxx, y+nyi+nyy, PT_SPRK);
 												}
-												docontinue = 0;
+												if(!(nostop && (ptypes[parts[r>>8].ctype].properties&PROP_CONDUCTS))){
+													docontinue = 0;
+												} else {
+													docontinue = 1;
+												}
 											}
 										} else if(destroy) {
 											if(parts[r>>8].type==PT_BRAY){