I've been reading that some folk might be attempting to wash/deacidify one of your own posters. Last night Sven discussed book keepers spray a magnesium based deacidification product. Based on my research I selected to use Calcium Hydroxide (CaOH) as a solution for deacidification. I completely soak the poster and rinse out the reactants. This is typically my first step outside of just getting the poster wet.
What you need to make it:
- Scale (capable of measuring grams)
- A 1 liter container
- A 2 liter container
- Distilled/deionized water
- Calcium Hydroxide Powder
Measure out 2g of the powder on the scale and mix with 1 liter of deionized water. Let it sit overnight, preferably 12 hours so the solution can reach equilibrium. This one liter of solution is concentrated and will need to be diluted by another 1 liter of water. Any of the CaOH that doesn't mix with the water is basically still powder and settles at the bottom - I gently stirr up the top part of the solution but leave the particulates at the bottom. Then I gently poor the mixed solution into the new container (leaving the remaining solid at the bottom) and then add the additional 1 liter of water. After you mix the solution a bit more it is ready to use.
If you don't have fancy 1L containers you can also recycle... I had to measure 1.5 grams to use these and then I'll poor them into the sprayer with equal parts deionized...
That second mouse in the bowl of cream we call life...