diff --git a/src/libphigs/f_binding/fb_el.c b/src/libphigs/f_binding/fb_el.c
index ce21b04..545e8c3 100644
--- a/src/libphigs/f_binding/fb_el.c
+++ b/src/libphigs/f_binding/fb_el.c
@@ -257,7 +257,7 @@ FTN_SUBROUTINE(psvwi)(
 /*******************************************************************************
  * psici
  *
- * DESCR:   set interior colour index
+ * DESCR:   set interior colour index for front face
  * RETURNS:   N/A
  */
 FTN_SUBROUTINE(psici)(
diff --git a/src/libphigs/f_binding/fb_extel.c b/src/libphigs/f_binding/fb_extel.c
index a7a2454..b9a5cad 100644
--- a/src/libphigs/f_binding/fb_extel.c
+++ b/src/libphigs/f_binding/fb_extel.c
@@ -902,6 +902,23 @@ FTN_SUBROUTINE(psbici)(
   pset_back_int_colr_ind(colr_ind);
 }
 
+/*******************************************************************************
+ * pbsi
+ *
+ * DESCR:   set back interior style
+ * RETURNS:   N/A
+ */
+FTN_SUBROUTINE(pbsi)(
+                     FTN_INTEGER(ints)
+                     )
+{
+  Pint_style interior_style = (Pint_style) FTN_INTEGER_GET(ints);
+#ifdef DEBUG
+  printf("DEBUG: PSBIS back interior style called to %d\n", (int)interior_style);
+#endif
+  pset_back_int_style(interior_style);
+}
+
 /*******************************************************************************
  * psbisi
  *
diff --git a/src/test_f/test_f3.f b/src/test_f/test_f3.f
index a5352e8..9adb3e7 100644
--- a/src/test_f/test_f3.f
+++ b/src/test_f/test_f3.f
@@ -29,15 +29,15 @@ SUBROUTINE VFILL(IX, NUM, IWHAT)
 
       SUBROUTINE INITCOLS(IWK1)
       COMMON /KXCCOL/ NCOL, IBLACK, IWHIT, IRED, IGREEN, IBLUE, IYEL,
-     ,                IMAG, ICYAN, IORAN, ICOL(7),
+     ,                IGREY, IMAG, ICYAN, IORAN, ICOL(7),
      ,                COLR(16), COLG(16), COLB(16)
       INTEGER         NCOL, IBLACK, IWHIT, IRED, IGREEN, IBLUE, IYEL,
-     ,                IMAG, ICYAN, IORAN, ICOL, ICLTB(16)
+     ,                IGREY, IMAG, ICYAN, IORAN, ICOL, ICLTB(16)
       REAL            COLR    ,COLG     ,COLB
       EQUIVALENCE    (IBLACK, ICLTB)
       REAL            FCOLR(3)
       INTEGER IWK1
-      NCOL = 6
+      NCOL = 7
       IBLACK = 1
       COLR(1) = 0.0
       COLG(1) = 0.0
@@ -56,7 +56,7 @@ SUBROUTINE INITCOLS(IWK1)
       IGREEN = 4
       COLR(4) = 0.0
       COLG(4) = 1.0
-      COLB(4) = 1.0
+      COLB(4) = 0.0
 
       IBLUE = 5
       COLR(5) = 0.0
@@ -68,6 +68,11 @@ SUBROUTINE INITCOLS(IWK1)
       COLG(6) = 1.0
       COLB(6) = 0.0
 
+      IGREY = 7
+      COLR(7) = 0.7
+      COLG(7) = 0.7
+      COLB(7) = 0.7
+
       DO I=1, NCOL
          FCOLR(1) = COLR(I)
          FCOLR(2) = COLG(I)
@@ -136,10 +141,10 @@ SUBROUTINE KYDELP (XORG, YORG, SCAL)
 *      COLOR LOOK UP TABLE DEFINITION
 *
       COMMON /KXCCOL/ NCOL, IBLACK, IWHIT, IRED, IGREEN, IBLUE, IYEL,
-     ,                IMAG, ICYAN, IORAN, ICOL(7),
+     ,                IGREY,IMAG, ICYAN, IORAN, ICOL(7),
      ,                COLR(16), COLG(16), COLB(16)
       INTEGER         NCOL, IBLACK, IWHIT, IRED, IGREEN, IBLUE, IYEL,
-     ,                IMAG, ICYAN, IORAN, ICOL, ICLTB(16)
+     ,                IGREY,IMAG, ICYAN, IORAN, ICOL, ICLTB(16)
       REAL            COLR    ,COLG     ,COLB
       EQUIVALENCE    (IBLACK, ICLTB)
 *
@@ -359,6 +364,7 @@ SUBROUTINE KYDELP (XORG, YORG, SCAL)
       IF ( NKPRT )                                  THEN
         CALL PSLWSC (1.0)
         CALL PSIS   (PSOLID)
+        CALL PSBIS  (PSOLID)
         CALL PSEWSC (1.0)
         CALL PSEDFG (1)
 *
@@ -404,6 +410,7 @@ SUBROUTINE KYDELP (XORG, YORG, SCAL)
         END DO
         CALL PSEDCI (IGREEN)
         CALL PSICI  (IGREEN)
+        CALL PSBICI  (IGREEN)
         CALL PFASD (PFNO, PEVF, PCD, 0, 0, IGREEN, 0., 0., 0., 0., 0,
      ,              0., 1, NPT11, EDATA, XG, YG, VCOLI, 0., VNXY, VNXY,
      ,              VNXY, 0, 0.)
@@ -433,8 +440,9 @@ SUBROUTINE KYDELP (XORG, YORG, SCAL)
 *
 *     Draw the Dolphin
         CALL PSIS(PSOLID)
-        CALL PSEDCI (IBLUE)
-        CALL PSICI  (153)
+        CALL PSEDCI(IBLUE)
+        CALL PSICI(153)
+        CALL PSBICI(153)
         CALL VFILL (VCOLI, NPT1, IBLUE)
         DO   I = 1, NPT1
           XG(I) = ((FLOAT (X1 (I))+OFFSET)*NORM - X0)*SCALE + XORG
@@ -447,6 +455,7 @@ SUBROUTINE KYDELP (XORG, YORG, SCAL)
 *     Dolphin tong
         CALL PSEDCI (IRED)
         CALL PSICI  (IRED)
+        CALL PSBICI  (IRED)
         CALL VFILL (VCOLI, NPT2, IRED)
         DO   I = 1, NPT2
           XG(I) = ((FLOAT (X2 (I))+OFFSET)*NORM - X0)*SCALE + XORG
@@ -459,7 +468,8 @@ SUBROUTINE KYDELP (XORG, YORG, SCAL)
 *     Dolphin eye
         CALL PSEDCI (IBLACK)
         CALL PSICI  (IBLACK)
-        CALL PSIS(PISEMP)
+        CALL PSBICI  (IBLACK)
+*        CALL PSIS(PISEMP)
         CALL VFILL (VCOLI, MAX (NPT3, NPT4), 0)
         DO   I = 1, NPT3
           XG(I) = ((FLOAT (X3 (I))+OFFSET)*NORM - X0)*SCALE + XORG
@@ -477,8 +487,11 @@ SUBROUTINE KYDELP (XORG, YORG, SCAL)
      ,              0, 0.)
 *
 *     Dolphin Z
-        CALL PSEDCI (IRED)
+        CALL PSEDCI (IBLACK)
+        CALL PSIS(PSOLID)
+        CALL PSBIS(PSOLID)
         CALL PSICI  (IRED)
+        CALL PSBICI  (IRED)
         CALL VFILL (VCOLI, NPT5, IRED)
         DO   I = 1, NPT5
           XG(I) = ((FLOAT (X5 (I))+OFFSET)*NORM - X0)*SCALE + XORG