Formaldehyde test | Stock solution ppm pH method | Textile testing

[@farhanamanzoor5635]

Sir osam bht kmal ki vedioa ha bht helpful

[@GhulamNabi-foodpoint]

Sir How we can preparied the caliibration curve plz make a vedio on it

[@MuhammadAli-uz2pf]

Sir G Calibirtion Curve bna dayn

[@ifranulaziz3234]

Why multifly by 0.6 & 1000