A solution changes the colour of the turmeric indicator from yellow to red. The solution is

Acid-base indicators (also known as pH indicators) are substances that change colour when exposed to acid or base. 

Turmeric is a naturally occurring yellow compound. When acid or neutral solutions are added to turmeric compound, which is an acid-base indicator, it remains yellow. When basic solutions, such as sodium hydroxide, are added to the solution, it turns red.