1. BHA requires acidity. For good work, right? 2. From staff formula BHA Toner Plus Vitamin: Salicylic Acid EZ™ (ชนิดละลายน้ำ) 10% Vitamin B3 5% Vitamin B5 2% Pro Polymer 0.3% [helps slightly thicken the formula. to prevent precipitation of BHA ] water 82.7% if adjusted Salicylic Acid EZ™ (ชนิดละลาย...