Ron, Garden shops have kits to test soil PH. Paul > On Jun 30, 2019, at 11:44 AM, ronroy at ca.inter.net wrote: > > Someone off clayart needs to know how to test PH in some materials. I suggested litmus paper - anyone know where to get some? > > RR > > Ron Roy > ronroy at ca.inter.net > Web page ronroy.net > >