The methods to retrieve the trademark color map include contacting the trademark office, searching the trademark database and finding the trademark registration agent.

1. Contact the Trademark Office: You can submit a written application to the local trademark office (such as China National Intellectual Property Administration) for consulting and obtaining the trademark color map.

2. Search trademark database: You can log in to China National Intellectual Property Administration trademark database or other relevant institutions to search, find and download your trademark color map. If you forget the trademark name or number, you can query it through the relevant retrieval tools provided by the Trademark Office.

3. Find a trademark registration agency: Trademark registration agencies generally keep trademark color maps for customers. You can retrieve the trademark color map by contacting the agency.