$clref = $dbh->prepare ("SELECT item_id, color FROM item WHERE prod_id = ".$ref->{product_id});
    $clref->execute();
    
    while (my $color, $item_id = $clref->fetchrow_hashref()
) {
        push @{$ref->{color}, {$ref->{item_id}}, $color->{color}, $item_id->{item_id};
    }