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Oxalic acid is a chemical compound that finds various applications, including marble cleaning and the removal of light rust patinas from metal objects, especially during the restoration of historical artifacts such as plaques, helmets, and studs.
To lighten wood, oxalic acid is dissolved in water or alcohol and then evenly applied to the wood surface using a brush. It is advisable to use diluted solutions and repeat the application until the desired color tone is achieved. After application, it is important to wash the wood with water and brush to remove any residues. Oxalic acid can cause shiny stains if not completely removed.
To remove rust patinas, the object to be treated is immersed in a solution of warm water and oxalic acid. It is important to avoid excessive acid quantity to prevent yellowing of the artifact, so it is better to proceed gradually. Afterwards, it should be thoroughly rinsed with demineralized water and brushed to remove the rust. To completely eliminate oxalic acid, it is recommended to immerse the object in demineralized water with the addition of baking soda.
In the case of thick rust, it may be preferable to use a rust converter.
It is important to take precautions when using oxalic acid. It should be stored in a well-ventilated area as it can emit toxic vapors. Avoid skin contact and inhalation of vapors, so wearing gloves, a mask with vapor filters, and protective goggles is advisable.
Hazard statements:
H302+H312 Harmful if swallowed or in contact with skin.
H318 Causes serious eye damage.
Precautionary statements:
Prevention:
P270 Do not eat, drink or smoke during use.
P280 Wear protective gloves/eye protection.
Response:
P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses if present and easy to do. Continue rinsing.
P310 Immediately call a POISON CENTER/doctor.
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