95% pin flat begin ethanol dehydration series 7 min dark spots? No Yes Evaluate 50% Clear 95% 100% 30% ethanol dehydration series (7 min each) pin flat 70% 100% ethanol/meth.sal. 7 min 5 to 10 min rubeanic acid Develop 70% 2× 3 min Carnoy’s 60 min 70% 30% H 2 O 5 min tungstate 10 to 12 min A:B:C View methyl salicylate (store in methyl salicylate) 24 to 48 hrs refrigerate in filling chamber Fill Fix Intensify rehydrate (5 min ea.) 95% rinse & store 50% H 2 O 2× rinse

Figure 3.2 Processing Flowchart. The procedure for development of the cobalt backfill. All percentage solutions are ethanol. Most of these steps should be done under a fume hood while wearing gloves. See the text for details.

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