indicators

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** neutral ** ||  ** Colour in weak alkali **  ||  ** Colour in strong alkali **  ||
 * ** Indicator ** ||  ** Colour in strong acid **  ||  ** Colour in weak acid **  ||  ** Colour **
 * ** pH ** || 1-3  ||  4-6  ||  7  ||  8-10  ||  11-14  ||
 * universal || red  ||  orange/yellow  ||  green  ||  blue  ||  purple  ||
 * methyl orange || red  ||   ||   ||  yellow  ||  yellow  ||
 * phenolphthalein || colourless  ||  colourless  ||   ||   ||  pink  ||
 * litmus || red  ||  red  ||   ||  blue  ||  blue  ||