how will you test the presence of base in any substance by using chine rose petals and phenolphthalein?

how will you test the presence of base in any substance by using chine

1.	how will you test the presence of base in any substance by using chine rose petals and phenolphthalein?
Answer» c paper turns into red when it is dipped into BASIC SOLUTION. TURMERIC paper does not CHANGE its colour with acid. CHINA Rose: China rose is another natural indicator. China rosesolution gives dark pink (magenta) colour with acid and green colour with base