diff --git a/Models/ReactionTest.cs b/Models/ReactionTest.cs
--- a/Models/ReactionTest.cs
+++ b/Models/ReactionTest.cs
@@ -216,7 +216,23 @@ namespace DesertPaintCodex.Models
                         // SPECIAL CASE:
                         // Check to see if we've got a white-shift reaction that's partially clipped, where we can
                         // still extrapolate the reaction, based on the available information.
-                        if (!testing3Way && (reaction != null))
+                        bool isWhiteShift = (reaction != null) && Clipped switch
+                        {
+                            ClipType.RedLow => (reaction.Blue == reaction.Green) && (reaction.Blue != 0),
+                            ClipType.RedHigh => (reaction.Blue == reaction.Green) && (reaction.Blue != 0),
+                            ClipType.BlueLow => (reaction.Red == reaction.Green) && (reaction.Red != 0),
+                            ClipType.BlueHigh => (reaction.Red == reaction.Green) && (reaction.Red != 0),
+                            ClipType.GreenLow => (reaction.Red == reaction.Blue) && (reaction.Red != 0),
+                            ClipType.GreenHigh => (reaction.Red == reaction.Blue) && (reaction.Red != 0),
+                            ClipType.RedLow|ClipType.BlueLow => (reaction.Green < 0),
+                            ClipType.RedLow|ClipType.GreenLow => (reaction.Blue < 0),
+                            ClipType.BlueLow|ClipType.GreenLow => (reaction.Red < 0),
+                            ClipType.RedHigh | ClipType.BlueHigh => (reaction.Green > 0),
+                            ClipType.RedHigh | ClipType.GreenHigh => (reaction.Blue > 0),
+                            ClipType.BlueHigh | ClipType.GreenHigh => (reaction.Red > 0),
+                            _ => false
+                        };
+                        if (!testing3Way && (reaction != null) && isWhiteShift)
                         {
                             PaintColor baseColor = _recipe.BaseColor;
                             if ((reaction.Red < 0) &&
@@ -226,7 +242,7 @@ namespace DesertPaintCodex.Models
                                 // White-shift down clip.
                                 extrapolated                    = ExtrapolateWhiteFromOneChannel(_observedColor.Red,   0, reaction.Red);
                                 if (!extrapolated) extrapolated = ExtrapolateWhiteFromOneChannel(_observedColor.Green, 0, reaction.Green);
-                                if (!extrapolated)                ExtrapolateWhiteFromOneChannel(_observedColor.Blue,  0, reaction.Blue);
+                                if (!extrapolated) extrapolated = ExtrapolateWhiteFromOneChannel(_observedColor.Blue,  0, reaction.Blue);
                             }
                             else if ((reaction.Red > 0) &&
                                 (reaction.Green > 0) &&
@@ -235,7 +251,7 @@ namespace DesertPaintCodex.Models
                                 // White-shift up clip.
                                 extrapolated                    = ExtrapolateWhiteFromOneChannel(_observedColor.Red,   255, reaction.Red);
                                 if (!extrapolated) extrapolated = ExtrapolateWhiteFromOneChannel(_observedColor.Green, 255, reaction.Green);
-                                if (!extrapolated)                ExtrapolateWhiteFromOneChannel(_observedColor.Blue,  255, reaction.Blue);
+                                if (!extrapolated) extrapolated = ExtrapolateWhiteFromOneChannel(_observedColor.Blue,  255, reaction.Blue);
                             }
                         }