Ind. Code § 23-14-31-31

Sec. 31. After an authorizing agent has executed a cremation authorization form, the authorizing agent may revoke the authorization and instruct the crematory authority to cancel the cremation and to release or deliver the human remains to another crematory authority or funeral home. The instructions must be provided to the crematory authority in writing. A crematory authority must comply with instructions given to the authority by an authorizing agent under this section if the crematory authority receives the instructions before beginning the cremation of the human remains.