diff --git a/brew/vecfit.m b/brew/vecfit.m
index f4840a5..09cd42b 100644
--- a/brew/vecfit.m
+++ b/brew/vecfit.m
@@ -22,41 +22,43 @@
 ## Author: Jens <jens@orion>
 ## Created: 2023-06-10
 
-function [P1, na_1, D] = vecfit (Pp, ignore_mask, Pt, P0, na_0, step)
+function [P1, na_1, D] = vecfit (Pp, element_mask, Pt, P0, na_0, step)
 
   [N_subst, N_elem] = size(Pp);
 
-  # Create default ignore_mask
-  if isempty(ignore_mask),
-    ignore_mask = ones(1,N_elem);
+  # Create default element_mask
+  if isempty(element_mask),
+    element_mask = ones(1,N_elem);
   end
 
   # A-Priory state with mask
-  P1 = P0 + sum(Pp.*na_0.*ignore_mask);
+  P1 = P0 + sum(Pp.*na_0.*element_mask);
 
   # Calc distance to target
   d = (Pt-P1);
   D = norm(d);
   dn = d/D;
 
-  subst_list = 1:N_subst;
-
+  # Enable all substances
+  subst_mask = ones(1, N_subst);
   while 1,
     # Find best prototype
     best_i = 0;
     best_k = 10000;
     best_dir = 1;
-    for i=subst_list,
-      p = Pp(i,:);
-      pn = p/norm(p);
+    for i=1:N_subst,
+      if subst_mask(i) == 1
+        p = Pp(i,:);
+        pn = p/norm(p);
 
-      # compare d and p
-      for vecdir=[1,-1],
-        k = norm(vecdir*pn - dn);
-        if k < best_k,
-          best_k = k;
-          best_i = i;
-          best_dir = vecdir;
+        # compare d and p
+        for vecdir=[1,-1],
+          k = norm(vecdir*pn - dn);
+          if k < best_k,
+            best_k = k;
+            best_i = i;
+            best_dir = vecdir;
+          end
         end
       end
     end
@@ -75,7 +77,7 @@ function [P1, na_1, D] = vecfit (Pp, ignore_mask, Pt, P0, na_0, step)
       # Check for negative n
       accu = na_1(best_i) + delta;
       if accu < 0,
-        subst_list(best_i) = [];
+        subst_mask(best_i) = 0;
         continue;
       end
       # Update point
@@ -83,6 +85,9 @@ function [P1, na_1, D] = vecfit (Pp, ignore_mask, Pt, P0, na_0, step)
 
       # Update Point accu
       na_1(best_i) = accu;
+
+      # Re-enable substance
+      subst_mask = ones(1, N_subst);
       break;
     end
 end