Bleach Formula Questions

Comments

• Eisenhower

  October 2022

  Charlie said:

  Step 1:  Deacidification with Calcium Hydroxide (Raises pH & give poster some alkalinity) 30 min

  Step 2:  Bleach with Calcium Hypochlorite (Reaction with substances in paper such as albumin, sizing, chromophores and etc. create chloramines and more acidic environment) As Desired

  Step 3:  Spray Acetic Acid to neutralize any unreacted chlorine and chloramines creating hydrochloric acid. 5 Minutes

  Step 4:  Deacidify the poster again with Calcium Hydroxide (you actually see solid Calcium Chloride leaving the poster)

  GENIUS! And there you have it! Nice and concise Charlie! 

  Not to be over complicated-rinse both sides, squeegee both sides and your good to lay it down on the Masa, or Mulberry. 

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• Eisenhower

  October 2022

  Duke said:

  Just watched a video that the conservator used ammonia in the distilled water to remove stains? Has anyone tried this approach to remove stains and improve the color?

  Clorox? Noooooooooo…..
  which video? Not posterfix…..

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• Charlie

  October 2022

  Duke said:

  What is acidic acid spray and where do you get it.

  Acetic - vinegar… 

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• Charlie

  October 2022

  No Clorox; there may be a method with ammonia but I would google cool conservation on that one.

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