Can DNA tests done through one ashes?

It is not possible. The DNA is destroyed and can not be recovered. DNA is a long chain of molecules , reducing it into ashes, would break all bond and, we would have only the presence of Atoms. here is the composition of Human Ashes according to ... read more

Experiments have been done on cremation ashes. DNA was recovered - but it was from crematorium staff, not the deceased, so represented post-cremation contamination. Unlike a crematorium oven, houses aren't designed to burn bodies hot or long enough to destroy organic matter totally, and DNA can often be recovered. read more

This is because many do not have access to, or are unaware of, new alternative approaches which can undeniably increase the amount and quality of DNA information drawn from cremated human remains. DNA is typically destroyed by high temperature when a proper cremation is conducted. read more