Developers: Volume–Percentage Conversion

When watching YouTube tutorials and reviews about hair bleaching, I noticed that in the US, they use the “Volume” of the Peroxide for indicating the strength (amount of Oxygen) of the developer, while in our country, the standards of the developers are labeled with Percentages (3%, 6%, 9%, 12%). (More about it here / Reference)

In case you’re somewhat confused — like me — and planning to purchase developers anytime soon here in the Philippines, here’s a chart of the conversion for your reference: