I found a old bottle of methyl orange in my microscope kit, in solid form. I added water to it to form methyl orange solution. I tried putting 2 drops of methyl orange on a spot plate, then adding sodium bicarbonate. I got pink foam, which is not what i expected, as methyl orange is suppose to turn yellow on sight of a base. Does anyone know what this "methyl orange" might be instead of methyl orange? This did come from the manufacturer of the microscope kit, which has a label saying Methyl Orange, so I am confused on why it does not act as an indicator. It was originally in the kit to act as a dye for biological samples.