PH Testing Pen Picture Frame Glazing suppressing the migrant acidity that

suppressing the migrant acidity that comes through handling and environmental sources

Made of ultra-clear

Designed to hold 35mm formats

0008% reducible sulfur content

PH Testing Pen Picture Frame Glazing suppressing the migrant acidity thatWith a simple swipe of our pH testing Pen, you can determine whether the paper and board you are using may be acidic. Easy to use, simply draw a small line on the material you wish to test. The line drawn will turn purple on most papers if there is an indication of pH neutrality. A clear or yellow color indicates the material may be unsuitable for conservation purposes. Paper can be reasonably long lived if its pH is 6. 0 or higher, especially if it