This description strongly points to Turpentine (also known as Turps, Spirits of Turpentine, or Rectified Turpentine), which is a classic, natural solvent used in oil painting.
Here is a breakdown of how the points match:
01 Used for cleaning tools and more while painting with Oil Colours: Turpentine is the standard solvent used to clean brushes, palettes, and other tools after using oil paints.
02 Volatile and solvent material, requires due care while using and storing: Turpentine is highly volatile and flammable, requiring careful handling and storage.
03 Rubs off the gloss and flexibility of colour film if mixed with colours: Turpentine is a powerful solvent. If too much is added to the oil paint, it “shortens” the oil binder, reducing the paint film’s strength, gloss, and flexibility.
04 Poses threat to the health of user, requires caution while using: Turpentine produces strong fumes that can cause headaches, dizziness, and respiratory irritation, necessitating good ventilation. (This is why many artists now prefer odorless mineral spirits).
05 100% vegan: Since it is derived from the distillation of tree resins (usually pine), it is a plant-based (vegan) product.
