Tressa Zone Control Perm Buffered acid pH 7.7 For normal, multiple porosity, highlighted (under 50%) and previously permed hair Self heating (exothermic) - no dryer heat required Stop action to prevent over processing Ensures even wave pattern throughout multi-porosity hair Recommended for rod to roller technique Soft but supportive curl/wave formation Pro tip: Fill the neutralizer bottle to the top (1 oz) with demi permanent, ammonia-free color, shake gently and apply just as you would the neutralizer, extending the processing time to 7 minutes total to maintain or refresh tones Made in the USA