1.Is Pencil Lead Toxic?

In fact, pencil leads are non-toxic. Lead metal is toxic, but pencil leads are mainly made of graphite and clay, so they contain no toxic substances.

The core of a pencil is mainly composed of graphite and clay. Graphite is a scaly solid with metallic luster, featuring carbon-carbon chemical bonds within each layer, while van der Waals forces exist between adjacent layers. Carbon-carbon bonds are highly stable and extremely difficult to break. This explains why diamond and graphite, both pure carbon substances, differ drastically in physical properties and market value. The human body contains no substances capable of breaking carbon-carbon bonds. Therefore, pencil leads are definitely safe (unless the clay additives contained in them are harmful to human health).

2.Is the metal part of the pencil barrel toxic?

English Translation (Stationery Popular Science, Standard Business English, Professional & Easy to Read)

The outer surface of pencil barrels is wrapped with film or coated with special pencil paint. This not only protects the barrel but also improves its appearance. However, trace heavy metals are contained in all pigments. Brief skin contact causes no harm, yet biting the pencil barrel and ingesting paint is not advisable.

I. Pencil Sharpening Tips (Wooden Pencils)

Use a pencil sharpener preferably and utility knives sparingly. Utility knives tend to snap leads and cut hands; only pencil sharpeners are permitted in exam halls.

Sharpen 0.3mm / nano ultra-thin leads slowly, and do not extend the lead too far out.

Avoid over-sharpening into an excessively long point. Overlong leads break easily while writing; keep a short conical tip for writing purposes.

Long leads are acceptable for sketching, yet avoid heavy pressure.

Sharpen colored pencils gently. Oil-based colored pencils contain wax, and water-soluble colored pencils feature soft texture; heavy sharpening may cause large chunks to crack off.

Clear wood shavings from the sharpener promptly. Accumulated shavings jam the blade, resulting in crooked tips and frequent lead breakage.

II. Standards for Writing & Drawing

Apply Moderate Pressure

Excessive force will crack wooden barrels, snap leads, roughen paper surfaces and leave stubborn scratch marks hard to erase.

For exam answer sheet marking, apply light multiple coats instead of poking holes through the sheet.

Match Pencils of Different Hardnesses to Scenarios

Hard leads (H, 2H): Use light pressure; heavy force will produce faint illegible marks.

Soft leads (2B, 4B): Avoid repeated smudging, which generates excessive powder and smudges paper surfaces.

Colored pencils: Do not apply excessive overlapping layers with oil-based varieties, as wax bloom will form and hinder pigment laydown.

Separate Drawings with Interleaving Paper for Left-Handed Users

Soft leads and standard graphite leads shed powder heavily. Do not drag your arm across fresh artwork immediately after drawing, which will blacken the picture.

Do Not Jab Forcefully with Mechanical Pencils

Though nano leads boast strong toughness, jabbing hard against desks or notebooks will still snap them. Limit extended lead length within 2mm.

III. Storage Guidelines (Prevent Breakage, Warping & Deterioration)

Keep Away from Moisture & Direct Sunlight

Damp environments: Wooden barrels swell and deform; dampened leads turn soft and break easily. Water-soluble colored pencils melt and clump when exposed to moisture.

Direct sunlight: Paint coatings crack, wood dries out and becomes brittle, and colored pencils fade and turn pale.

Avoid Squeezing & Heavy Weight

Do not stack heavy schoolbags or objects on top of pencil boxes. Internal invisible cracks will form inside leads, causing breakage upon writing.

Store pencils upright; do not bend or fold them for storage. Keep pencil cases vertical to prevent tip collision between pencils.

Maintain Stable Temperature

Do not place pencils on windowsills or beside heating equipment. High temperatures melt the wax in oil-based colored pencils, sticking leads together.

IV. Critical Safety Guidelines (For Students)

Strictly Prohibit Biting Pencils

Barrel paint and lead powder must not be ingested. Long-term pencil biting harms health and risks swallowing wood shavings from cracked barrels.

Do Not Point Pencil Tips at Others

Do not run or horseplay while holding pencils; sharp tips may pierce classmates or eyes.

Do Not Scatter Discarded Shavings & Lead Dust

Empty sharpener debris gently. Inhalation of graphite dust causes discomfort, and colored pigment dust should also be avoided.

Sharp Edges on Eraser Metal Ferrules

The thin aluminum ferrules on eraser-tipped pencils have sharp edges that may cut skin. Extra supervision is required for children.

V. Special Reminders for Different Pencil Types

1. Standard Graphite Pencils (HB / 2B for Exams)

Only standard 2B pencils shall be used for answer sheet marking; H-grade leads produce faint marks unrecognizable by scanning machines.

Avoid large-area repeated erasing on answer sheets, as residual dust triggers misreads by marking scanners.

2. Nano Mechanical Pencil Leads

Do not pair thin nano leads with low-quality mechanical pencils; overly tight lead clamps snap delicate thin leads.

Retract leads fully when the pencil is not in use to prevent breakage from collisions.

3. Water-Soluble Colored Pencils

Use thick watercolor paper only for water-wash painting; ordinary thin paper soaks through and wrinkles.

Let painted artwork dry completely before storage; never stack damp watercolor drawings.

4. Oil-Based Colored Pencils

Finished oil color artworks attract dust and smudge easily. Spray fixative for long-term preservation.

Avoid prolonged close contact with plastic stationery; melted wax will adhere permanently to plastic surfaces.

VI. Tips to Extend Pencil Service Life

Stop writing immediately after lead breakage; continued hard scribbling tears paper.

Minor cracks on wooden pencil barrels can be sealed with a small amount of glue; wait for full drying before reuse.

Retract all leads fully inside mechanical pencils during long-term disuse.

Seal colored pencil boxes tightly after use and store away from light to prevent pigment fading.