How to store and care for manga at home

Why manga can turn yellow even in the dark

Paper is not a uniform material. Fibres, lignin, acidity, additives and manufacturing affect how it ages. Inks, adhesives and coatings can also change. Two books stored together may therefore age differently.

Hydrolysis shortens cellulose chains: water takes part in the reaction, while acidity and heat can accelerate it. The paper loses strength. Oxidation can produce compounds that change its colour. Cellulose itself can yellow; lignin is not the only factor.

When light drives these changes, we call it photochemical degradation. This is also a chemical process. Darkness reduces that component without stopping every other reaction. Good care slows change and prevents avoidable damage.

Further reading: [1] [2] [3]

How much light should manga receive?

Avoid direct sunlight: it is intense and can heat the book. Indirect daylight and artificial light can also contribute to damage. What matters is light intensity together with exposure time.

UV-filtering glazing can reduce part of the risk, but visible light still reaches paper and inks. Likewise, an LED should not be treated as harmless simply because it emits little UV.

Turn display lighting off when you are not looking at the collection. For a cover you want to display permanently, consider a reproduction while storing the valuable original safely. Rotating displayed books reduces future exposure; dark storage does not undo earlier damage.

Further reading: [4] [5]

Temperature and humidity: useful targets

There is no need to chase a perfect reading every hour. Choose a suitable environment, measure it and address real problems. These are practical home targets, not boundaries beyond which a book suddenly becomes damaged.

High humidity encourages distortion and, given suitable conditions and enough time, mould. The Canadian Conservation Institute recommends keeping paper collections below 65% RH: this is a preventive limit, not the target to aim for.

Dry and damp conditions are not identical risks. Lower humidity can slow the chemical deterioration of acidic paper, but a manga volume also contains adhesives and covers. Do not try to dry it out as far as possible without control.

Further reading: [6] [7] [8]

Where to keep a collection at home

Choose the location before buying accessories. A regularly used room, away from sunlight and heat sources, is generally easier to manage than a hot attic or a damp basement. A box cannot correct a persistently damp environment.

Keep books off the floor and away from possible water leaks. Do not place the collection against a cold or damp external wall. Use smooth, continuous shelves deep enough to support the whole book.

Further reading: [9] [10] [11]

Upright or flat: protecting edges and bindings

Standing a book upright does not automatically damage it. It is suitable for sound, compact tankōbon when they stay straight and have support at both sides. Problems arise when a book leans, bends, is squeezed or rests unevenly.

A large, flexible manga magazine needs more attention: its weight and limited stiffness can encourage distortion. Storing an important copy flat with full support is a cautious application of conservation guidance for large or fragile books, rather than an experimentally proven rule for every magazine.

Check where the dust jacket and obi rest: an overhanging edge can fold if it bears a load or catches on something. There is no universal safe number of books in a stack; weight, size, stiffness and condition all matter.

Further reading: [12] [13] [14]

Choosing sleeves, boxes and silica gel

A sleeve limits dirt and rubbing; a rigid enclosure adds support; an opaque box also blocks light. These protections are not interchangeable and can be combined.

Look for polyethylene (PE), polypropylene (PP) or polyester PET sleeves without unsuitable additives or coatings. Avoid PVC and unidentified plastics. Boxes and boards touching the book should be acid-free and lignin-free. The word ‘archival’ alone does not adequately specify a product.

Choose a sleeve that lets the volume slide in without forcing corners or the obi. Work on a clean surface and keep closure adhesive away from paper. A buffered board does not automatically deacidify the manga’s pages.

To choose the right size, see the guide to formats and protective sleeves: measure the copy’s width, height and depth.

Further reading: [10] [9] [15] [16]

How to take out, read and inspect manga

Use clean, dry hands and an uncluttered surface. Cotton gloves can reduce sensitivity and make turning pages harder; they are not automatically the safest choice for books.

Do not pull on the top of the spine. Make room between neighbouring books and grasp the volume gently. Use both hands for a heavy magazine, supporting it underneath. Do not force a binding open to 180 degrees.

Photographs of the covers, page edges and colophon can save repeated inspections of collectible copies. To monitor colour over time, use similar lighting: a phone’s white balance can make paper appear more or less yellow.

If you find damage, avoid improvised repairs. Adhesive tape, sanding and attempted bleaching can alter the book. Protect important copies and seek a conservator’s assessment before intervening.

The guide to alterations explains how to recognise interventions and changes to collectible copies.

Further reading: [17] [12] [18]

What a slab protects against, and when to consider grading

A slab reduces direct contact and many handling risks. Beckett describes a PETG holder and an ultrasonically sealed rigid case for manga. This does not mean the paper stops ageing or that temperature and humidity cease to matter.

The public documentation reviewed did not provide sufficient quantitative specifications to assign a particular UV filtration level, watertightness or humidity control to BGS manga slabs. Keep graded books away from sunlight and in a suitable environment.

Bagging a comic does not stop every chemical process either. A University of Pisa study detected volatile compounds inside archival bags containing comics. It did not establish that those bags were worse than open storage, and it did not test BGS slabs.

If you plan to certify an exceptional copy, protect it immediately and consider grading before further handling or poor storage introduces defects. There is no reliable ‘one year equals a fixed grade loss’ formula: materials, environment and damage can produce very different outcomes.

Market value is a separate consideration. Grading can help where buyers pay a premium for certification, but demand, completeness, fees and shipping risks still matter. A raw copy can also be stored well; the decision to grade depends on your plans for the book.

For grades, labels and separate book and dust-jacket assessments, continue with the BGS grading guide.

Further reading: [19] [20] [21]

A simple routine for your collection

You do not need to remove and inspect every volume constantly. Start with environmental readings and the outside of enclosures, then investigate when something changes.

Further reading: [22] [11]