Check these out:

http://www.ihcworld.com/_protocols/chromogen_substrates/POD_DAB_brown.htm

https://www.abcam.com/kits/dab-staining (no commercial interest)

Good luck!

@Sathya Srinivasan

These are both more of a high level overview of the IHC process, and may be used as a reference to build a protocol for whatever you may need:

Pubmed: Article Basics of Immunohistochemistry

Abcam: https://www.abcam.com/kits/introduction-to-immunohistochemistry-ihc

Abcam is a particularly good source of information; I have used their products previously and their customer service has been stellar as well.