I get peroxide from a hairdresser (50 strength). Not sure if the 50 is %.
Have used ammonia and peroxide for bleaching, but the ammonia can burn the materials. I have been just using the peroxide for the last few times. Takes longer with just the peroxide but material can be in the solution for many hours without damage. The ammonia and peroxide also has a very strong and bad odor when mixed.
 
Harmen

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