We’ll make your Khan Academy worksheets print in rich black, not gray. Quick scan:
• Printing from Chrome/Edge or Safari? PDF viewer or the web page directly?
• Printer model/driver path (AirPrint/IPP, PCL, PostScript). Is there a Black & White or Grayscale toggle?
• Symptoms: pale body text, light graphs/axes, gray backgrounds using lots of ink, or color bleed when it should be monochrome?
Goal: enable a **high-contrast** pipeline → K-only black text, no unnecessary gray backgrounds, and crisp borders for student handouts.

That’s common with browser printing. Pages use CSS colors and thin lines; Chrome may lighten backgrounds or convert text to composite gray (CMYK mix) instead of K-only. Also the Background graphics toggle can add screen-tinted areas. We’ll:
1) Force **Black & White / K-only** in the driver.
2) Use the **System dialog** to access vendor settings (Edge/Chrome → More settings → Print using system dialog).
3) Decide whether to **disable Background graphics** (to remove gray fills) or enable it if borders vanish.
4) Save a **preset** called “KA High-Contrast”.

Windows + Chrome (recommended)
• Press Ctrl+P → More settings → click **Print using system dialog**.
• In **Printer Properties**: set **Color: Black & White / Grayscale**. On many HP/Canon drivers there’s an extra **Black Ink Only / K-only** mode — use that for darkest text.
• Disable **Draft/Econo**. Set **Quality** to Normal/Best for classroom copies.
• In Chrome’s panel: keep **Background graphics** off to avoid gray page tints; turn it on only if page borders or gridlines disappear.

macOS (Safari/Chrome/Edge)
• File → Print → open the dropdown with layout options.
• In **Color/Quality** or **Color Matching**, pick **Black & White / Grayscale**. If available, choose **Black Ink Only** (prevents composite gray made from CMY).
• Click **Presets → Save Current Settings as Preset…** → name it KA High-Contrast and choose **Only this printer** (or All printers if consistent).
• If borders vanish, enable **Background graphics** in Chrome/Edge (More settings → Background graphics) for that print only.

Prefer a **PDF path** when possible: download any available printable or use Khan Academy’s Materials to share or print resources for cleaner handouts. For pages without a print view, use the browser’s **Print** and our high-contrast preset; avoid scaling tricks that lighten text. If you must capture practice output, export to PDF first, then print with **Black & White** enabled.

Try two toggles:
• In Chrome/Edge print panel → **More settings → Background graphics**: turn **on** if borders/grids are missing; turn **off** if light gray page fills waste ink.
• In the driver, leave **K-only** on; some drivers add **Edge control/Sharpen text** which darkens thin lines without bolding body text.
If your printer supports **600 dpi**, keep it enabled for crisp axes and tick marks.

Correct — **Grayscale** can still mix CMY. Look for a driver option named **Black Ink Only / Use Black Cartridge Only / K-only**. Save it in your preset. If the option doesn’t exist, use the model-specific driver (not generic AirPrint) to expose it, or switch to a **mono** queue where available.

Teacher preset (KA High-Contrast): 1) Chrome/Edge → **Print using system dialog**. 2) **Black & White** and, if present, **Black Ink Only (K-only)**. 3) Quality = Normal/Best (not Draft). 4) Toggle **Background graphics** per page: off to remove gray tints; on if borders disappear. 5) Save as preset **KA High-Contrast**. Need help creating presets on every staff device? Open the chat.