Mike Johnston wrote: Stop bath mixed for use has about the same acidity as orange juice or urine. I reply: If your urine is acidic, you either need to see the doctor or we have a new specie! I agree with everyone about being overcautios with chemicals - being bound up with PPE and suffering from nerves is probably as good a recipe for an accident as blatant carelessness. Now back to the alcohol experiments. I'm getting some wonderful colours with Tequila............ mike - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org.