SQL Select - Group by values from horizontal table alignment to Vertical

I need to list our values from Table A that are not in Table B.  Table A contains a list of all attributes and their values from products.  These attribute values need to be compared to table B which just contains a list of all valid values for each attribute.  Each value in table A is listed a separate column; Value1; Value 2; Value3 and Value 4.   Each of these values from each of these columns needs to be compare with Table B and then report the values not found in a vertical alignment when each attribute and value are a separate row. 

Table A   (List of Products with values)        
 AttributeID          Value 1       Value2       Value3   Value4        
   Color                 Black        White                         Pink
   MaterialType     Wood                            Plastic
   Finish                                 Glossy          Satin    Other
     

 Table B  (List Valid Values)
 AttributeID         AttributeValue
  Color                   Black
  Color                   Blue
  Color                   Orange
  MaterialType       Plastic
  Finish                 Satin
  Finish                 Primed

Report Expectations (only list the attribute values not found in table B)
AttributeID           Value
Color                    White
Color                    Pink
MaterialType        Wood
Finish                   Glossy
Finish                   Other