How to use Oxalic Acid Solution 9.95%

Oxalic Acid Solution 9.95% is a powerful and versatile cleaner, widely used for rust removal, wood bleaching, stone restoration, and more. Whether you're a DIY enthusiast, professional tradesperson, or beekeeper, this high-strength solution offers effective results. In this comprehensive guide, we'll explore its applications, safety measures, and where to purchase it in the UK.

What is Oxalic Acid Solution 9.95%?

Oxalic acid is a naturally occurring organic compound found in plants like rhubarb and spinach. In its concentrated form, it serves as a potent cleaning agent. The 9.95% solution is the highest concentration legally available for consumer use in the UK, making it ideal for challenging cleaning tasks.

Regulations Note: Oxalic acid in concentrations above 10% is classified as a regulated poison in the UK. To buy or use it legally above that threshold, private individuals need a Home Office Explosives Precursors and Poisons (EPP) licence.

If you’re a DIYer, beekeeper, or working in marine maintenance, it’s far more practical to use a solution under the 10% threshold—which keeps you safe, legal, and productive.

Applications of Oxalic Acid Solution 9.95%

1. Rust Removal from Metal Surfaces

Oxalic acid effectively dissolves rust, restoring metal objects to their original condition.

How to Use:

• Preparation: Clean the metal surface to remove loose debris and grease.

• Application: Apply the oxalic acid solution directly to the rusted areas using a brush or by immersing small items in the solution.

• Dwell Time: Allow the solution to work on the rust for up to 20 minutes.

• Scrubbing: Use a non-abrasive brush or cloth to scrub away the loosened rust.

• Rinsing: Thoroughly rinse the metal with water and dry it promptly to prevent flash rusting.

Expert Tip: After rust removal, consider applying a protective coating to the metal to prevent future corrosion.

2. Wood Bleaching and Restoration

Oxalic acid is renowned for its ability to lighten and rejuvenate aged or stained wood. It effectively removes tannin stains, watermarks, and discoloration caused by exposure to the elements.

How to Use:

• Preparation: Ensure the wood surface is clean and free from dirt or existing finishes. Sanding may be necessary for heavily stained areas.

• Application: Apply the oxalic acid solution evenly using a brush or sponge.

• Dwell Time: Allow the solution to sit on the wood for approximately 20 minutes.

• Neutralization: Rinse the treated area thoroughly with clean water to remove any residual acid.

• Drying: Let the wood dry completely before applying any finishes or sealants.

Expert Tip: For stubborn stains, a second application may be necessary. Always test on a small, inconspicuous area first to assess the results.

3. Cleaning and Brightening Stone Surfaces

Oxalic acid effectively removes stains, grime, and discoloration from stone surfaces such as marble and granite, enhancing their natural beauty.

How to Use:

• Preparation: Clean the stone surface to remove loose dirt and debris.

• Application: Apply the oxalic acid solution evenly using a soft cloth or sponge.

• Dwell Time: Allow the solution to sit for up to 10 minutes.

• Scrubbing: Gently scrub the surface with a soft-bristled brush.

• Rinsing: Rinse thoroughly with clean water and dry with a soft cloth.

Expert Tip: Always test the solution on a small, inconspicuous area first to ensure it does not adversely affect the stone's finish.

4. Removing Stains from Fabrics

Oxalic acid can eliminate stubborn stains such as ink, food, and rust from fabrics.

How to Use:

• Preparation: Dampen the stained area with water.

• Application: Apply a small amount of the oxalic acid solution directly to the stain.

• Dwell Time: Let it sit for up to 10 minutes.

• Rinsing: Rinse the fabric thoroughly with cold water.

• Laundering: Wash the fabric as usual.

Expert Tip: Do not use oxalic acid on delicate fabrics without prior testing, as it may weaken certain fibers.

5. Beekeeping Equipment Cleaning

Many beekeepers utilize oxalic acid as part of their routine maintenance practices. It's often used to clean hive components and tools due to its ability to remove stains and sanitize surfaces.

How to Use:

• Preparation: Ensure the equipment is free from bees and organic debris.

• Application: Apply the solution to affected areas using a spray bottle or cloth.

• Dwell Time: Let it sit briefly before scrubbing.

• Rinsing: Rinse thoroughly with water and allow to dry before reuse.

Expert Tip: Always wear protective gear and follow safety instructions when working with oxalic acid around beekeeping materials.

6. Marine Applications – Boat Hull Cleaning

Saltwater, algae, barnacles, and waterline stains can build up on fiberglass and gelcoat surfaces. Oxalic acid is widely favored for marine cleaning due to its efficiency and non-abrasive properties.

How to Use:

• Preparation: Rinse off large debris and dirt from the hull.

• Application: Apply the oxalic acid solution with a spray bottle or brush.

• Dwell Time: Let it sit for 10–15 minutes, but do not let it dry.

• Scrubbing: Gently scrub the surface with a soft-bristled brush.

• Rinsing: Rinse thoroughly with clean water and dry with a soft cloth.

Expert Tip: Always test the solution on a small, inconspicuous area first to ensure it does not adversely affect the surface.

7. Tile and Grout Brightening

Oxalic acid works wonders on stubborn mildew stains and deep-seated dirt in grout lines.

How to Use:

• Preparation: Clean off surface dust or grime.

• Application: Apply a small amount of the 9.95% solution using a toothbrush or grout brush.

• Dwell Time: Let it soak for 5–10 minutes.

• Scrub and Rinse: Scrub thoroughly and rinse with warm water.

Expert Tip: Don’t use on colored grout unless tested—it can bleach out pigments.

Safety Precautions

• Protective Gear: Always wear gloves, eye protection, and a mask when handling oxalic acid.

• Ventilation: Use in a well-ventilated area to avoid inhaling fumes.

• Storage: Keep the solution in a cool, dry place, away from children and pets.

• First Aid: In case of contact with skin or eyes, rinse immediately with plenty of water and seek medical advice if necessary.

Where to Buy Oxalic Acid Solution 9.95% in the UK

• HD Chemicals: Purchase directly from the manufacturer at HD Chemicals.

• Amazon UK: Available with Prime delivery at Amazon UK.

FAQs

1. Is oxalic acid safe to use on all types of wood?

   • It's effective on most woods but always test on a small area first.

2. Can I use oxalic acid indoors?

   • Yes, but ensure proper ventilation and protective gear.

3. How do I neutralize oxalic acid after use?

   • Rinse the area thoroughly with water; for wood, a baking soda solution can be used.

4. Is it safe for septic systems?

   • In small amounts, yes. Avoid large quantities entering the system.

5. Can it remove black water stains from wood?

   • Yes, it's particularly effective for such stains.

6. Is it biodegradable?

   • Yes, oxalic acid is biodegradable.

7. Can I use it on colored fabrics?

   • Test on a hidden area first, as it may bleach colors.

8. What's the shelf life of the solution?

   • When stored properly, it can last several years.

9. Is it effective against mold?

   • It can help remove mold stains but doesn't kill mold spores.

10. Can it be used on kitchen countertops?

• Only on stone surfaces like granite or marble and always test a small area first.