The only flooring that's likely to be available in a natural charcoal colour is wenge. You will be able to find images on the net. We don't have details of its fire properties but suppliers of wenge may have this information. The other alternative is to select one of the species that we have tested and stain it a charcoal colour. You will find fire test data in our Regulatory Information Report RIR 21419-05, available for download via this link https://www.woodsolutions.com.au/articles/fire-test-reports.Wenge
Answered on 27-02-2021
Please note that our answer is based on the best advice available at the time. If the National Construction Code, Australian Standards or local requirements have been subsequently amended, our answer may no longer be correct in all details. For more information, please read our disclaimer.