diff --git a/pdpbox/pdp.py b/pdpbox/pdp.py
index de5a031..c545e7e 100644
--- a/pdpbox/pdp.py
+++ b/pdpbox/pdp.py
@@ -641,6 +641,8 @@ def pdp_interact_plot(pdp_interact_out, feature_names, plot_type='contour', x_qu
                 'inter_fill_alpha': 0.8,
                 # fontsize for interact plot text
                 'inter_fontsize': 9,
+                # custom matplotlib.colors.Normalize object used for normalizing 'marginal effect' color scale
+                'norm': None,
             }
 
     Returns
@@ -752,6 +754,7 @@ def pdp_interact_plot(pdp_interact_out, feature_names, plot_type='contour', x_qu
 
     _plot_title(title=title, subtitle=subtitle, title_ax=title_ax, plot_params=plot_params)
 
+    norm = plot_params.get('norm', None)
     inter_params = {'plot_type': plot_type, 'x_quantile': x_quantile, 'plot_params': plot_params}
     if num_charts == 1:
         feature_names_adj = feature_names
@@ -766,7 +769,7 @@ def pdp_interact_plot(pdp_interact_out, feature_names, plot_type='contour', x_qu
         else:
             inter_ax = plt.subplot(outer_grid[1])
             fig.add_subplot(inter_ax)
-            _pdp_inter_one(pdp_interact_out=pdp_interact_plot_data[0], inter_ax=inter_ax, norm=None,
+            _pdp_inter_one(pdp_interact_out=pdp_interact_plot_data[0], inter_ax=inter_ax, norm=norm,
                            feature_names=feature_names_adj, **inter_params)
     else:
         wspace = 0.3
@@ -788,7 +791,7 @@ def pdp_interact_plot(pdp_interact_out, feature_names, plot_type='contour', x_qu
                 inner_inter_ax = plt.subplot(inner_grid[inner_idx])
                 fig.add_subplot(inner_inter_ax)
                 _pdp_inter_one(pdp_interact_out=pdp_interact_plot_data[inner_idx], inter_ax=inner_inter_ax,
-                               norm=None, feature_names=feature_names_adj, **inter_params)
+                               norm=norm, feature_names=feature_names_adj, **inter_params)
             inter_ax.append(inner_inter_ax)
 
     axes = {'title_ax': title_ax, 'pdp_inter_ax': inter_ax}