> "Treatment to the chart included: brushing to remove loose surface dirt and debris, separating the chart from its heavy linen backing, washing the chart in de-ionised water adjusted to a neutral pH with calcium hydroxide to remove the soluble discolouration and some of the acidity, a ‘de-acidification’ treatment by immersion in a bath of magnesium hydrogen carbonate to deposit an alkaline reserve in the paper, and finally repairing tears and losses using a Japanese kozo paper and wheat starch paste. "
That's a really cool process.