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Author Message   Aemb04 Tinkerer Username: Aemb04 Post Number: 14 Registered: 04-2013 Rating: N/A Votes: 0 Posted on Monday, July 29, 2013 - 03:05 pm:    Hi Fidji, When you say 50% hydrogen peroxide and 50% ammonia does the hydrogen peroxide also need to be 50% strength/concentration as I can only find 35% strength on the web in the UK, would this do the job.