Sun Exposure
Direct sunlight can cause quartz to fade and yellow over time. The UV rays from the sun can break down the resin that binds the quartz particles together. Placing your countertop near a window or in a room with a lot of natural light increases the chance of discoloration.
To prevent sun damage, try using window treatments like blinds or curtains to block some of the sunlight. You can also apply a UV-protective sealer to the countertop to help protect it from fading. Reapplying the sealer every 1-2 years will maintain its effectiveness.
Heat Exposure
Exposing quartz counters to excessive heat can also cause yellowing or discoloration. The heat can damage the resin binder and alter the color pigments. Using hot pans directly on the surface allows heat to penetrate into the countertop and cause changes over time.
Avoid placing hot pans, bakeware, or other heated items right on the quartz. Always use trivets or hot pads. Take care not to expose the countertop to heat above 150°F to prevent potential damage.
Chemical Exposure
Certain household chemicals can stain or discolor quartz surfaces. Cleaners with dyes, solvents or acidic ingredients may react with the resin in the countertop and cause it to yellow. Even daily cleaning products like window cleaners can have adverse effects if left to sit too long on the surface.
Be sure to read labels and only use cleaners made specifically for quartz and stone surfaces. Spot test new products on a small inconspicuous area first. Avoid harsh chemicals like oven cleaners, drain openers, etc. Use only non-abrasive soft cloths, never scrub pads.
Poor Maintenance
Over time, buildup of dirt, grime, soap scum and hard water deposits can give quartz a yellowish dingy appearance if not properly cleaned. Quartz needs regular maintenance to keep it looking bright and clean.
Clean quartz at least once a week with a mild soap and water. Use a soft cloth, sponge or non-abrasive brush. More frequent cleaning is needed for heavy-use kitchen counters. An occasional deep clean with a stone-safe cleaner can remove built-up residues.
Etching and Scratching
Surface damage from cuts, scratches or etching can allow stains to penetrate and discolor the surrounding area. Acidic foods and drinks like lemon juice, vinegar or wine can eat away the surface leaving etched marks if not cleaned up promptly.
Take care not to cut or scrape quartz, and wipe up spills immediately to prevent etching. Regular application of a sealer can help minimize staining and etching. Honing or polishing is required to remove or minimize scratches and etched spots.
Manufacturing Defects
In some cases, the discoloration may be due to variances in the manufacturing process. Imperfect mixing of resins or color pigments or inadequate UV protections during production can lead to yellowing or inconsistent coloring over time.
If the yellowing is present when the countertop is newly installed, contact the manufacturer regarding warranty coverage for defects. For surfaces past the warranty period, professional refinishing or replacement may be necessary in severe cases.
How To Restore a Yellowed Quartz Countertop
If your quartz counter has developed a yellowish tint, there are steps you can take to improve its appearance:
- Try cleaning with a stone cleaner, hydrogen peroxide or mild bleach solution. This can help remove some staining and discoloration.
- Use a countertop polish made for quartz to enhance shine and color. Avoid polishes with dyes or waxes. Reapply polish regularly.
- Apply a quartz color enhancer to even out color tone and minimize yellowing. Enhancers are temporary solutions that need reapplying every few months.
- For etched or scratched areas, professional refinishing is recommended. This involves honing and polishing the surface to remove damage and restore luster.
- For severe discoloration cases, full resurfacing or replacing sections may be needed. Consult a countertop pro to assess options.
Maintaining Your Quartz Countertop
Regular care and maintenance can help prevent quartz counters from future discoloration:
- Clean with a mild soap and soft cloth weekly. Rinse well and dry completely.
- Immediately wipe up all spills, especially acidic substances like wine or fruit juice.
- Avoid exposing quartz to direct sunlight. Close curtains or blinds to limit UV exposure.
- Use trivets and hot pads for hot pans and bakeware. Keep heat under 150°F.
- Reapply a penetrating sealer every 1-2 years for added stain protection.
- Inspect for signs of damage regularly. Repair minor scratches and etching promptly.
Frequently Asked Questions
Why does heat damage quartz counters?
Excessive heat can damage the resin that binds quartz particles together. Over time, this causes the resin to yellow and discolor.
Does bleach discolor quartz?
Diluted bleach or hydrogen peroxide are generally safe for periodic use on quartz. But repeated heavy exposure to harsh chemicals like concentrated bleach can eventually cause discoloration.
Can you get rid of scratches in a quartz countertop?
Light scratches can be minimized by buffing with a countertop polish. Deeper scratches need professional refinishing to completely remove the marks. Avoid using scrub pads, sharp knives or abrasives that can scratch.
How long does a quartz sealer last?
For heavy use kitchen countertops, expect to reapply a penetrating sealer every 1-2 years. Less frequent applications may be needed for low use surfaces. Check manufacturer instructions.
Does vinegar damage quartz?
Yes, vinegar is acidic and can etch quartz surfaces if left to sit. Rinse any vinegar spills immediately with water and avoid letting vinegar reside too long during cleaning.
Conclusion
Yellowing and discoloration of quartz countertops can occur over time due to various factors. Sunlight, heat and chemical exposure are common culprits, along with inadequate cleaning. Proper care and maintenance is key to minimizing the chances of quartz counters turning yellow. Address any damage right away and use sealers and polishes to keep your quartz looking its best. With some diligence, quartz can maintain its beauty and last for many years in your home.