If you’re asking if you can laser engrave them you need anodized aluminum blanks, not silver ones.
Previously:
That thread has a link to a source for what you may want to try. Anodized aluminum engraves really nicely.
More examples of anodized:
https://community.glowforge.com/search?q=anodized%20in%3Afirst%20%23glowforge-project-examples