What is the best method to revert back to 'golden' image of database

Hello,
I want to have a 'golden' image of my test database. What is the best method to keep reverting back to this 'golden' image after testers are done with testing. What I mean is I want to set up a test database for testers. Testers can insert,update, delete on objects as they like. But after the testers have completed their testing, I want to revert the database back to the 'golden' image. This 'golden' image is the state of the database before testers perform their tests. I need to revert back to the 'golden' image many times over as we have to perform many different tests.
I thought about export and import (9i database) but takes 6 hours, too long. I tried using rman and was successful the first time, (set until time; restore database; recover database; open resetlogs;). The seconde time using rman, I got error saying the set until time was before the resetlogs time. I think I would have to restore the control file before the resetlog time frame before I can recover to the set until time, again.
What is a straight forward method to have a 'golden' image so I can keep on restoring back to it? This database is a test 9i database and it is in archive log mode but it doesn't need to be. I just need a best practice method, whether it is rman, exp/imp, manual backup/restore? Something I can use time and time over again. Thank you.

If it is a Test envionment, can you just take a COLD Backup (database files
plus control files) ? How big is the database ? What platform is it on ?
eg in a COLD Backup
a. If using a script, run multiple "cp" (or cpio/tar) commands in parallel to
copy different database files
b. If using RMAN (in NOMOUNT), use multiple Chnanels.
Note : Remember to include ControlFile Backups and Restores as well.

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