Traditional Daguerreotype processing involves mercury vapor with safety and environmental problems. Years ago I met a Daguerrotypist who attributed his failing health to mercury poisoning. He died as a fairly young man, as did others when the Daguerreotype was popular. Quality Daguerreotypes are difficult to make. Some of the required materials aren't as available as when they were in demand. On the other hand, some people like the challenge of a difficult and dangerous process, or are masochists.