What Is Acid Free Tissue Paper and Why It Matters for Storage?

Acid-free tissue paper is a conservation-grade paper with a neutral or slightly alkaline pH that protects stored items from the deterioration ordinary paper causes.

A wool sweater pulled from a box after five years, yellowed along every fold, tells you what regular tissue paper does to stored goods. The paper itself turns brittle and brown, and it takes everything it touches down with it. Acid-free tissue breaks that chain. It costs more than the drugstore stuff, and knowing which type to buy — buffered or unbuffered — decides whether your storage job helps or hurts.

What Separates Acid-Free Tissue From Regular Tissue?

The word “acid-free” alone is not a guarantee. Some papers sold under that label still start as wood pulp and can turn acidic over time, so they need checking and replacing. True conservation-grade tissue is built from purified plant fiber or cotton with the lignin, alum, and other impurities stripped out — the exact components that break down into acid as paper ages.

You’ll find it sold as flat sheets or on rolls. Sheets are easier to cut to a container’s dimensions; rolls suit large, flat items or recurring wrapping jobs.

Buffered vs. Unbuffered Tissue: Which One To Buy?

That second category is bigger than most people expect. Leather, silk, wool, ivory, bone, dyes, and photographs can all be damaged by an alkaline buffer, which is why unbuffered tissue is the standard recommendation for them. The Smithsonian’s Museum Conservation Institute lists acid-free tissue among the materials used for textile and costume storage and handling.

Get the pairing wrong and you’ve spent conservation money to cause the exact harm you were avoiding.

The Library and Archives Canada conservation notes on storing works on paper lay out the interleaving method directly: cut tissue sheets to fit the container, then place one sheet between each item so nothing shifts or rubs.

Where Acid-Free Tissue Actually Helps In A Storage Box

In practice the paper does three jobs — wrapping, padding, and supporting — and each one has a specific technique that makes it worth the price.

Wrapping and interleaving

Interleave prints, drawings, and photos with one sheet between each piece. Wrap textiles loosely rather than tightly, and pad the sharp folds where fabric creases hardest. The goal is separating surfaces so friction never gets a chance to abrade them.

Lining and humidity

One museum manual notes that acid-free tissue helps buffer humidity changes and reduces condensation when it lines a box. That effect is modest, not a substitute for climate control, but a lined box behaves better than a bare one over a season.

Long-term checks

Any acid-free paper, even good stock, can degrade eventually. Inspect the tissue each time you open the container. If it has yellowed or gone brittle, replace it — the paper is cheaper than the object inside. The National Archives guidance for family archives makes the same argument for choosing enclosure materials that don’t themselves become the problem. If you’re stocking up for a proper storage setup, these tested acid-free tissue picks show which sheets and rolls hold up best.

What Acid-Free Tissue Won’t Fix

Acid-free tissue slows deterioration — it doesn’t stop it, and it can’t counteract a bad environment around it.

• Heat, direct light, and high humidity still do damage regardless of what wraps the item.
• Buffered tissue can harm leather, silk, wool, and photographs, so type matters more than brand.
• Regular tissue, cardboard, and wood remain wrong for long-term textile storage, since all three are acidic.
• Conservation-grade tissue costs more than basic acid-free stock, and the gap is real.

Match the tissue to the object, keep the box cool and dark, and check the paper every so often. That routine does more for a stored collection than any single material can on its own.