diff --git a/sigprops_retrofotos_SLUB.xml b/sigprops_retrofotos_SLUB.xml
index d2a1360c464a8f1438e34d3bbcc5c9317dcde412..b9be2bcc277ac11c2469b779796eac54b0dafaee 100644
--- a/sigprops_retrofotos_SLUB.xml
+++ b/sigprops_retrofotos_SLUB.xml
@@ -38,7 +38,7 @@
         <SignificantProperty>
             <PropertyName>Schärfe</PropertyName>
             <PropertyExplanation>Das Objekt ist scharf abgebildet.</PropertyExplanation>
-            <PropertyCategory>Rendering</PropertyCategory>
+            <PropertyCategory>Content</PropertyCategory>
             <PropertyProcedure>designated communities</PropertyProcedure>
         </SignificantProperty>
 	<SignificantProperty>
@@ -77,11 +77,5 @@
             <PropertyCategory>Structure</PropertyCategory>
             <PropertyProcedure>designated communities</PropertyProcedure>
         </SignificantProperty>
-        <SignificantProperty>
-            <PropertyName>Spektraltiefe</PropertyName>
-            <PropertyExplanation>Das Objekt ist spektralgetreu.</PropertyExplanation>
-            <PropertyCategory>Rendering</PropertyCategory>
-            <PropertyProcedure>designated communities</PropertyProcedure>
-        </SignificantProperty>
     </SignificantProperties>
 </ObjectType>