There are many ways to copy Blob column from one server to Another like,
1. Generate file from blob in source server, and import file into destination server using Tools like SQL developer, TOAD.
2. Using DBLink,
INSERT INTO BLOB_TEST SELECT BLOB_COL1 FROM TEST_BLOB@SOURCEDB;
3. I have recently discovered, you can make dynamic insert statement and run as normal insert statement in destination server.
Example here: sample_blob
Scripts to make dynamic script can be written as
Set serveroutput on
DECLARE
M BLOB;
n NUMBER:=1;
c blob;
l_limit NUMBER:=4000;
vm RAW(32767);
BEGIN
Dbms_Output.Put_Line('DECLARE
c BLOB;
BEGIN
dbms_lob.createtemporary(c,true);');
SELECT BLOB_COL INTO M FROM TEST_BLOB;
--Dbms_Output.Put_Line(Length(M));
while (n+l_limit<=length(m)) loop
vm:=(dbms_lob.substr(M,l_limit,n));
Dbms_Output.Put_Line('dbms_lob.writeappend(c,'||Length(vm)/2||','''||VM||''');');
n:=n+l_limit;
END LOOP;
vm:=(dbms_lob.substr(M,length(m)-n+999,n));
Dbms_Output.Put_Line('dbms_lob.writeappend(c,'||Length(vm)/2||','''||VM||''');');
Dbms_Output.Put_Line('INSERT INTO blob_test VALUES (c,9);
END;
/');
END;
/