How to exract a string from blob column value?

Summary:

I am trying to extract a string from the blob column value from fa_fusion_soainfra.WFMESSAGEATTRIBUTE table.

Content (required):

Version (include the version you are using, if applicable):

22C

Code Snippet (add any code snippets that support your topic, if applicable):

I tried this but I am able to extract particular string

SELECT  TO_CHAR(dbms_lob.substr(wf.blobvalue, 1530,1)) as my_blob

FROM fa_fusion_soainfra.WFMESSAGEATTRIBUTE WF