EcoColors Haircolor does not contain resorcinol and never has. An ingredient present, methyl -resorcinol is a different ingredient altogether. There are no concerns at all for this ingredient as far as toxicity goes. EcoColors Haircolor was created with non toxic in mind and in accordance with the EU directive. This means all ingredients are in safe quantities .This does not mean EcoColors is hypoallergenic. ALWAYS do a test strand and an allergy test according to the kit directions before applying any colorant to your entire head.