PH is a little high. I used the Lineco PH/Acid test pen and it turned out to be purple. This product is NOT acid free. Please refer to the photo and note the purple tone. If it were "acid free" it would be yellow or clear. The real disappointment. I will use it to play with alcohol ink and various mediums, but if you don't want it to last long don't touch other objects. Keep it separate from your archive holdings. Suitable for cards, decorations and anything you don't need to keep white, change the color of your media or store it for a long time. So disappointing and expensive. The Yupo paper is to the right of the picture. At least it's not dark purple, so it's in the 6.3 to 6.5 range.
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