The solvent is used to give fluidity to nail polishes. It can also be used to dilute older nail polishes that started to dry out.
Instructions for use:
Apply 4 – 5 drops of the solvent in the nail polish, tightly close the nail polish bottle’s cap and shake well. If too much solvent is added the nail polish may become too fluid and may irreversibly damage the nail polish (it does not regain viscosity).