Does anyone have experience using Scotch Positionable Mounting Adhesive? It claims to be "Acid-Free", which they qualify to be "Ph of 7 or greater as determined by modified ASTM D778-97 (by extraction)", whatever that means.
They also say it is "Photo Safe".
Does "Acid-Free" mean archival? They don't use that word anywhere on the box, so I'm suspicious.