diff --git a/attack.cpp b/attack.cpp
index 939a92c8..5c75ff59 100644
--- a/attack.cpp
+++ b/attack.cpp
@@ -302,8 +302,15 @@ EX void prespill(cell* c, eWall t, int rad, cell *from) {
   // block spill
   if(t == waTemporary) return;
   // cwt.at->item = itNone;
-  if(rad) for(cell *c2: adj_minefield_cells(c))
-    prespill(c2, t, rad-1, c);
+  if(rad) for(auto p: adj_minefield_cells_with_orientation(c)) {
+    prespill(p.first, conditional_flip_slime(p.second, t), rad-1, c);
+    }
+  }
+
+EX eWall conditional_flip_slime(bool flip, eWall t) {
+  if(flip && t == waFloorA) return waFloorB;
+  if(flip && t == waFloorB) return waFloorA;
+  return t;
   }
 
 EX void spillfix(cell* c, eWall t, int rad) {
@@ -311,8 +318,9 @@ EX void spillfix(cell* c, eWall t, int rad) {
     changes.ccell(c);
     c->wall = t;
     }
-  if(rad) for(cell *c2: adj_minefield_cells(c))
-    spillfix(c2, t, rad-1);
+  if(rad) for(auto p: adj_minefield_cells_with_orientation(c)) {
+    spillfix(p.first, conditional_flip_slime(p.second, t), rad-1);
+    }
   }
 
 EX void spill(cell* c, eWall t, int rad) {
diff --git a/cell.cpp b/cell.cpp
index 5d07129b..e6b4ef49 100644
--- a/cell.cpp
+++ b/cell.cpp
@@ -1331,7 +1331,7 @@ EX int neighborId(cell *ofWhat, cell *whichOne) {
 
 EX int mine_adjacency_rule = 0;
 
-EX map<cell*, vector<cell*>> adj_memo;
+EX map<cell*, vector<pair<cell*, bool>>> adj_memo;
 
 EX bool geometry_has_alt_mine_rule() {
   if(S3 >= OINF) return false;
@@ -1340,17 +1340,17 @@ EX bool geometry_has_alt_mine_rule() {
   return true;
   }
 
-EX vector<cell*> adj_minefield_cells(cell *c) {
-  vector<cell*> res;
+EX vector<pair<cell*, bool>> adj_minefield_cells_with_orientation(cell *c) {
+  vector<pair<cell*, bool>> res;
   if(mine_adjacency_rule == 0 || !geometry_has_alt_mine_rule())
-    forCellCM(c2, c) res.push_back(c2);
+    forCellIdCM(c2, i, c) res.emplace_back(c2, c->c.mirror(i));
   else if(WDIM == 2) {
     cellwalker cw(c, 0);
     cw += wstep;
     cw++;
     cellwalker cw1 = cw;
     do {
-      res.push_back(cw.at);
+      res.emplace_back(cw.at, cw.mirrored);
       cw += wstep;
       cw++;
       if(cw.cpeek() == c) cw++;
@@ -1373,7 +1373,7 @@ EX vector<cell*> adj_minefield_cells(cell *c) {
         auto& vertices1 = ss1.vertices_only_local;
         for(hyperpoint h: vertices) for(hyperpoint h2: vertices1)
           if(hdist(h, T * h2) < 1e-6) shares = true;
-        if(shares) res.push_back(c1);
+        if(shares) res.emplace_back(c1, det(T) < 0);
         }
       if(shares || c == c1) forCellIdEx(c2, i, c1) {
         if(cl.listed(c2)) continue;
@@ -1387,6 +1387,13 @@ EX vector<cell*> adj_minefield_cells(cell *c) {
   return res;
   }
 
+EX vector<cell*> adj_minefield_cells(cell *c) {
+  vector<cell*> res;
+  auto ori = adj_minefield_cells_with_orientation(c);
+  for(auto p: ori) res.push_back(p.first);
+  return res;
+  }
+
 EX vector<int> reverse_directions(cell *c, int dir) {
   if(PURE && !(kite::in() && WDIM == 2)) return reverse_directions(c->master, dir);
   int d = c->degree();
diff --git a/celldrawer.cpp b/celldrawer.cpp
index d3410a86..085b2a18 100644
--- a/celldrawer.cpp
+++ b/celldrawer.cpp
@@ -502,6 +502,8 @@ void celldrawer::setcolors() {
       }
     
     case waFloorA: case waFloorB: // isAlch
+      wcol = winf[conditional_flip_slime(det(V.T) < 0, c->wall)].color;
+
       if(c->item && !(history::includeHistory && history::infindhistory.count(c)))
         fcol = wcol = iinf[c->item].color;
       else
@@ -2422,7 +2424,7 @@ void celldrawer::draw_monster_full() {
       moncol >>= 1;
 
     if(c->monst == moSlime) {
-      moncol = winf[c->wall].color;
+      moncol = winf[conditional_flip_slime(det(V.T) < 0, c->wall)].color;
       moncol |= (moncol>>1);
       }
     
diff --git a/passable.cpp b/passable.cpp
index 64bb49f6..fd8b07dd 100644
--- a/passable.cpp
+++ b/passable.cpp
@@ -89,9 +89,16 @@ EX bool strictlyAgainstGravity(cell *w, cell *from, bool revdir, flagtype flags)
   }
 
 EX bool anti_alchemy(cell *w, cell *from) {
-  bool alch1 = w->wall == waFloorA && from && from->wall == waFloorB && !w->item && !from->item;
-  alch1 |= w->wall == waFloorB && from && from->wall == waFloorA && !w->item && !from->item;
-  return alch1;
+  if(!from) return false;
+  if(!isAlchAny(w)) return false;
+  if(!isAlchAny(from)) return false;
+  if(w->item) return false;
+  if(from->item) return false;
+  if(!nonorientable) return w->wall != from->wall;
+  forCellIdEx(c1, i, w)
+    if(c1 == from && (w->c.mirror(i) ? w->wall != from->wall : w->wall == from->wall))
+      return false;
+  return true;
   }
 
 #if HDR
diff --git a/pcmove.cpp b/pcmove.cpp
index 417ac3a6..b843b8cc 100644
--- a/pcmove.cpp
+++ b/pcmove.cpp
@@ -1112,7 +1112,7 @@ bool pcmove::perform_actual_move() {
     });
   if(c2->item && isAlch(c2)) {
     if(alchMayDuplicate(cwt.at->wall)) {
-      c2->wall = cwt.at->wall;
+      c2->wall = conditional_flip_slime(mi.mirror(), cwt.at->wall);
       c2->wparam = cwt.at->wparam;
       }
     else