Paper preservation
PH testing pen
A fast, non-destructive testing pen using phenol red to instantly indicate the surface pH of paper and material. Essential for conservators and preservation professionals.
A fast, non-destructive testing pen using phenol red to instantly indicate the surface pH of paper and material. Essential for conservators and preservation professionals.
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- Instant pH feedback
- Non-destructive
- Portable & easy to use
- Trusted indicator
- Conservation-grade
This pH testing pen is a vital diagnostic tool for anyone working in archives, libraries, museums, or conservation labs. It contains a phenol red indicator solution that reacts instantly upon contact with a surface. A violet mark means a neutral to slightly alkaline surface (pH > 6.8), which is generally safe for long-term storage. A yellowish or clear result warns of acidity, signaling a potential risk to material longevity. This quick spot-check tool helps professionals assess the safety of materials used in storage, exhibition, or treatment.
Compact and easy to use, it requires no special equipment—just touch the tip to the surface and read the color.
Product Type:
Surface pH Testing Pen
Indicator Solution:
Phenol Red
pH Detection Range:
Approximately pH 5.5 – 8.0
Color Indicators:
-
Violet = pH > 6.8 (neutral to alkaline)
-
Yellow/Clear = pH < 6.8 (acidic)
Application Method:
Touch the felt tip directly to the material surface
Drying Time:
Immediate to a few seconds
Non-Destructive:
Yes, when applied correctly on dry surfaces
Refillable:
No – single-use, disposable pen
Dimensions:
Standard marker size (approx. 13.5 cm length)
Shelf Life:
Several months (store capped, upright)
Storage Conditions:
Room temperature, away from direct sunlight
Recommended For:
Paper, cardboard, textiles, wood-based materials, archival storage supplies
Packaging Unit:
1 pen per order
How and where to use the pH Testing Pen:
-
Surface pH assessment
Gently touch the pen tip to sample areas on paper, board, textiles, or other heritage materials. Immediate color feedback reveals whether the surface is safe (violet) or acidic (yellow/clear). -
Conservation and archival evaluation
Rapidly identify acidic surfaces in books, documents, and paper-based artefacts. Critical for prioritizing deacidification measures. -
Museum & gallery prep
Test display mounts, backing boards, museum housing, to ensure materials won’t accelerate degradation. -
Packaging & storage fit
Screening packaging supplies (folders, sleeves, mount boards) before use helps avoid introducing harmful acidity into storage environments. -
Restoration readiness
Before adhesives, wash treatments, or consolidation, verify the pH to prevent unintended chemical interactions.
