diff --git a/c/spot/source/GPOS.c b/c/spot/source/GPOS.c
index 7b83350d..947c719d 100644
--- a/c/spot/source/GPOS.c
+++ b/c/spot/source/GPOS.c
@@ -1894,31 +1894,89 @@ static void proofPosPair2(PosPairFormat2 *fmt, IntX glyphtoproof1, IntX glyphtop
                     }
                     /* skip proofing glyph if all pos values are 0. */
                     if (label[0] != '\0') {
-                        if (isVert)
-                            proofCheckAdvance(proofctx, abs(vwidth) + abs(vwidth2));
-                        else
-                            proofCheckAdvance(proofctx, width + width2);
-                        proofClearOptions(&options);
-                        if (isVert)
-                            options.newvwidth = vwidth + yadv;
-                        else
-                            options.newwidth = width + xadv;
-                        proofDrawGlyph(proofctx,
-                                       g1, ANNOT_SHOWIT,                                               /* glyphId,glyphflags */
-                                       nam1, ANNOT_SHOWIT | (isVert ? ANNOT_ATRIGHT : ANNOT_ATBOTTOM), /* glyphname,glyphnameflags */
-                                       NULL, 0,                                                        /* altlabel,altlabelflags */
-                                       0, 0,                                                           /* originDx,originDy */
-                                       0, 0,                                                           /* origin,originflags */
-                                       (isVert) ? vwidth : width, 0,                                   /* width,widthflags */
-                                       &options, (isVert) ? yorig : DEFAULT_YORIG_KANJI, (VORGfound != 0) ? "*" : "");
-                        proofDrawGlyph(proofctx,
-                                       g2, ANNOT_SHOWIT,                                                                       /* glyphId,glyphflags */
-                                       nam2, ANNOT_SHOWIT | (isVert ? ANNOT_ATRIGHTDOWN1 : ANNOT_ATBOTTOMDOWN1),               /* glyphname,glyphnameflags */
-                                       label, ANNOT_SHOWIT | ANNOT_BOLD | (isVert ? ANNOT_ATRIGHTDOWN2 : ANNOT_ATBOTTOMDOWN2), /* altlabel,altlabelflags */
-                                       xpla, ((isVert) ? (-1) : (1)) * ypla,                                                   /* originDx,originDy */
-                                       0, 0,                                                                                   /* origin,originflags */
-                                       (isVert) ? vwidth2 : width2, 0,                                                         /* width,widthflags */
-                                       NULL, (isVert) ? yorig2 : DEFAULT_YORIG_KANJI, "");
+                        if (((featuretag == STR2TAG("kern")) ||
+                             (featuretag == STR2TAG("vkrn"))) &&
+                            proofIsAltKanjiKern()) {
+                            ValueRecord leftvr, rightvr;
+                            Card16 lvfmt, rvfmt;
+                            IntX doLeft, doRight;
+                            IntX awidth = width;
+                            IntX awidth2 = width2;
+                            
+                            clearValueRecord(&leftvr);
+                            clearValueRecord(&rightvr);
+                            doLeft = GPOSlookupFeatureGlyph((featuretag == STR2TAG("vkrn")) ? (STR2TAG("vpal")) : (STR2TAG("palt")),
+                                                            g1, &lvfmt, &leftvr);
+                            doRight = GPOSlookupFeatureGlyph((featuretag == STR2TAG("vkrn")) ? (STR2TAG("vpal")) : (STR2TAG("palt")),
+                                                            g2, &rvfmt, &rightvr);
+                            if (doLeft) {
+                                awidth += leftvr.XAdvance;
+                                vwidth = -(abs(vwidth) + leftvr.YAdvance);
+                            }
+
+                            if (doRight) {
+                                awidth2 += rightvr.XAdvance;
+                                vwidth2 = -(abs(vwidth2) + rightvr.YAdvance);
+                            }
+
+                            if (isVert)
+                                proofCheckAdvance(proofctx, abs(vwidth) + abs(vwidth2));
+                            else
+                                proofCheckAdvance(proofctx, awidth + awidth2);
+                            proofClearOptions(&options);
+                            if (isVert) {
+                                if (yadv)
+                                    options.newvwidth = -(abs(vwidth) + yadv);
+                                else
+                                    options.newvwidth = -(abs(vwidth) + xadv);
+                            } else {
+                                options.newwidth = awidth + xadv;
+                            }
+                            proofDrawGlyph(proofctx,
+                                           g1, ANNOT_SHOWIT,                                                                              /* glyphId,glyphflags */
+                                           nam1, ANNOT_SHOWIT | (isVert ? ANNOT_ATRIGHT : ANNOT_ATBOTTOM),                                     /* glyphname,glyphnameflags */
+                                           NULL, 0,                                                                                            /* altlabel,altlabelflags */
+                                           (doLeft) ? (leftvr.XPlacement) : 0, ((isVert) ? (-1) : (1)) * ((doLeft) ? (leftvr.YPlacement) : 0), /* originDx,originDy */
+                                           0, 0,                                                                                               /* origin,originflags */
+                                           (isVert) ? vwidth : awidth, 0,                                                                       /* width,widthflags */
+                                           &options, (isVert) ? yorig : DEFAULT_YORIG_KANJI, (VORGfound != 0) ? "*" : "");
+
+                            proofDrawGlyph(proofctx,
+                                           g2, ANNOT_SHOWIT,                                                                                              /* glyphId,glyphflags */
+                                           nam2, ANNOT_SHOWIT | (isVert ? ANNOT_ATRIGHTDOWN1 : ANNOT_ATBOTTOMDOWN1),                                                   /* glyphname,glyphnameflags */
+                                           label, ANNOT_SHOWIT | ANNOT_EMPHASIS | (isVert ? ANNOT_ATRIGHTDOWN2 : ANNOT_ATBOTTOMDOWN2),                                 /* altlabel,altlabelflags */
+                                           (doRight) ? (rightvr.XPlacement + xpla) : xpla, ((isVert) ? (-1) : (1)) * ((doRight) ? (rightvr.YPlacement + ypla) : ypla), /* originDx,originDy */
+                                           0, 0,                                                                                                                       /* origin,originflags */
+                                           (isVert) ? vwidth2 : awidth2, 0,                                                                                             /* width,widthflags */
+                                           NULL, (isVert) ? yorig2 : DEFAULT_YORIG_KANJI, "");
+                        } else /* don't use alt metrics */
+                        {
+                            if (isVert)
+                                proofCheckAdvance(proofctx, abs(vwidth) + abs(vwidth2));
+                            else
+                                proofCheckAdvance(proofctx, width + width2);
+                            proofClearOptions(&options);
+                            if (isVert)
+                                options.newvwidth = vwidth + yadv;
+                            else
+                                options.newwidth = width + xadv;
+                            proofDrawGlyph(proofctx,
+                                           g1, ANNOT_SHOWIT,                                               /* glyphId,glyphflags */
+                                           nam1, ANNOT_SHOWIT | (isVert ? ANNOT_ATRIGHT : ANNOT_ATBOTTOM), /* glyphname,glyphnameflags */
+                                           NULL, 0,                                                        /* altlabel,altlabelflags */
+                                           0, 0,                                                           /* originDx,originDy */
+                                           0, 0,                                                           /* origin,originflags */
+                                           (isVert) ? vwidth : width, 0,                                   /* width,widthflags */
+                                           &options, (isVert) ? yorig : DEFAULT_YORIG_KANJI, (VORGfound != 0) ? "*" : "");
+                            proofDrawGlyph(proofctx,
+                                           g2, ANNOT_SHOWIT,                                                                       /* glyphId,glyphflags */
+                                           nam2, ANNOT_SHOWIT | (isVert ? ANNOT_ATRIGHTDOWN1 : ANNOT_ATBOTTOMDOWN1),               /* glyphname,glyphnameflags */
+                                           label, ANNOT_SHOWIT | ANNOT_BOLD | (isVert ? ANNOT_ATRIGHTDOWN2 : ANNOT_ATBOTTOMDOWN2), /* altlabel,altlabelflags */
+                                           xpla, ((isVert) ? (-1) : (1)) * ypla,                                                   /* originDx,originDy */
+                                           0, 0,                                                                                   /* origin,originflags */
+                                           (isVert) ? vwidth2 : width2, 0,                                                         /* width,widthflags */
+                                           NULL, (isVert) ? yorig2 : DEFAULT_YORIG_KANJI, "");
+                        }
                         proofThinspace(proofctx, 2);
                     } /* end if kern pair has a non-zero value. */
                 }     /* end if sorting kern pairs for output - else */