High Solubility Oxalic Acid Wood Bleach for Corrosion Resistant Wood Stain Removal and Furniture Restoration

Title: What is Oxalic Acid? | The Ultimate Guide to Uses, Benefits & Safety

Content:
Oxalic acid is a powerful organic acid with the chemical formula H₂C₂O₄. Found naturally in many plants like rhubarb and spinach, it is also produced industrially for a vast array of applications. This versatile compound exists as a white crystalline powder that is highly soluble in water. On this page, we explore the science behind oxalic acid, its most common industrial and domestic uses, and the critical safety protocols for handling it. As a leading supplier, we provide high-purity oxalic acid in various grades to meet the precise needs of manufacturers, artisans, and professionals worldwide. Discover why this essential chemical is a cornerstone in industries from metal cleaning to wood restoration.

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Molecular Formula: C₂H₂O₄·2H₂O (Dihydrate)
CAS No.: 6153-56-6 (Dihydrate)
Appearance: White crystalline powder or granules, highly soluble in water.

In the field of woodworking and furniture restoration, oxalic acid is a recognized and highly effective wood bleach. Wood discoloration can arise from various sources, including metal stains (e.g., black spots around iron nails), fungal staining, sun oxidation, or simple aging. The oxalic acid solution provided by this product penetrates deep into wood fibers, effectively breaking down these discoloring substances through chemical reactions. For black spots caused by iron ions, oxalic acid converts them into colorless ferric oxalate, which can then be washed away; for many other pigments, it acts as a reducing bleach. The application process is typically two-step: first, apply the oxalic acid solution evenly to the wood surface, keeping it wet to allow sufficient reaction (usually several hours). After the wood is completely dry, apply a mild alkaline solution (e.g., diluted borax water or baking soda water) to neutralize the acid, stopping the reaction and preventing potential issues from residual acid later. After neutralization, wipe with a clean water cloth and allow to dry thoroughly. This treatment significantly lightens and evens out the wood's surface color, restoring its natural beauty and creating a perfect base for subsequent staining or oiling. Please note that the bleaching effect varies with wood species and the cause of discoloration, and the process may slightly raise the wood grain, potentially requiring a light final sanding.

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