drop table if exists tangotemp; 

create table tangotemp (
  color  varchar(255)
);

insert into tangotemp values
   ('white'),
   ('light aluminum'),
   ('aluminum'),
   ('dark aluminum'),
   ('light charcoal'),
   ('charcoal'),
   ('dark charcoal'),
   ('black')
;

plot piechart
  pievalues, pielabels, color override
  with
    font "bookman" plain 13
select
  10, color, color from tangotemp;