Violan thrones

S. violaceus Viola method Violanthrone dyes Violan thrones Violet acid [578-85-8]... 

The lower plate separated from the upper plate by an air gap is covered by a polymethyl methacrylate polymer into which organic dye (e.g. 16-17-diheptanyloxy-violan-throne) has been dissolved. The organic dye can be interchanged by a fluorescent complex. 

---