diff --git a/app/helpers/artist_versions_helper.rb b/app/helpers/artist_versions_helper.rb
index 24d1f2527..8947cd0c3 100644
--- a/app/helpers/artist_versions_helper.rb
+++ b/app/helpers/artist_versions_helper.rb
@@ -3,10 +3,12 @@ module ArtistVersionsHelper
     diff = artist_version.other_names_diff(artist_version.previous)
     html = []
     diff[:added_names].each do |name|
-      html << '<ins>' + h(name) + '</ins>'
+      prefix = diff[:obsolete_added_names].include?(name) ? '<ins class="obsolete">' : '<ins>'
+      html << prefix + h(name) + '</ins>'
     end
     diff[:removed_names].each do |name|
-      html << '<del>' + h(name) + '</del>'
+      prefix = diff[:obsolete_removed_names].include?(name) ? '<del class="obsolete">' : '<del>'
+      html << prefix + h(name) + '</del>'
     end
     diff[:unchanged_names].each do |name|
       html << '<span>' + h(name) + '</span>'
@@ -18,10 +20,12 @@ module ArtistVersionsHelper
     diff = artist_version.urls_diff(artist_version.previous)
     html = []
     diff[:added_urls].each do |url|
-      html << '<li><ins>' + h(url) + '</ins></li>'
+      prefix = diff[:obsolete_added_urls].include?(url) ? '<ins class="obsolete">' : '<ins>'
+      html << '<li>' + prefix + h(url) + '</ins></li>'
     end
     diff[:removed_urls].each do |url|
-      html << '<li><del>' + h(url) + '</del></li>'
+      prefix = diff[:obsolete_removed_urls].include?(url) ? '<del class="obsolete">' : '<del>'
+      html << '<li>' + prefix + h(url) + '</del></li>'
     end
     diff[:unchanged_urls].each do |url|
       html << '<li><span>' + h(url) + '</span></li>'
diff --git a/app/models/artist.rb b/app/models/artist.rb
index a4de0028d..2b5932d25 100644
--- a/app/models/artist.rb
+++ b/app/models/artist.rb
@@ -43,9 +43,13 @@ class Artist < ActiveRecord::Base
       end
     end
 
+    def url_array
+      urls.map(&:url)
+    end
+
     def save_url_string
       if @url_string
-        prev = urls.map(&:url)
+        prev = url_array
         curr = @url_string.scan(/\S+/).uniq
 
         duplicates = prev.select{|url| prev.count(url) > 1}.uniq
@@ -69,11 +73,11 @@ class Artist < ActiveRecord::Base
     end
 
     def url_string
-      @url_string || urls.map {|x| x.url}.join("\n")
+      @url_string || url_array.join("\n")
     end
 
     def url_string_changed?
-      url_string.scan(/\S+/) != urls.map(&:url)
+      url_string.scan(/\S+/) != url_array
     end
   end
 
diff --git a/app/models/artist_version.rb b/app/models/artist_version.rb
index b7f73c2ca..39642596c 100644
--- a/app/models/artist_version.rb
+++ b/app/models/artist_version.rb
@@ -67,26 +67,39 @@ class ArtistVersion < ActiveRecord::Base
   end
 
   def urls_diff(version)
+    latest_urls = artist.url_array
     new_urls = url_array
     old_urls = version.present? ? version.url_array : []
 
+    latest_urls  = latest_urls.map {|url| ArtistUrl.legacy_normalize(url)}
     new_urls = new_urls.map {|url| ArtistUrl.legacy_normalize(url)}
     old_urls = old_urls.map {|url| ArtistUrl.legacy_normalize(url)}
 
+    added_urls = new_urls - old_urls
+    removed_urls = old_urls - new_urls
+
     return {
-      :added_urls => new_urls - old_urls,
-      :removed_urls => old_urls - new_urls,
+      :added_urls => added_urls,
+      :removed_urls => removed_urls,
+      :obsolete_added_urls => added_urls - latest_urls,
+      :obsolete_removed_urls => removed_urls & latest_urls,
       :unchanged_urls => new_urls & old_urls,
     }
   end
 
   def other_names_diff(version)
+    latest_names = artist.other_names_array
     new_names = other_names_array
     old_names = version.present? ? version.other_names_array : []
 
+    added_names = new_names - old_names
+    removed_names = old_names - new_names
+
     return {
-      :added_names => new_names - old_names,
-      :removed_names => old_names - new_names,
+      :added_names => added_names,
+      :removed_names => removed_names,
+      :obsolete_added_names => added_names - latest_names,
+      :obsolete_removed_names => removed_names & latest_names,
       :unchanged_names => new_names & old_names,
     }
   end