Litmus test. A red litmus paper strip was dipped into 1M sodium hydroxide (NaOH). Its colour changed to blue indicating an alkaline solution. | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Giphotostock |
Taille de l’image : | 3426 px × 5158 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |