What brand of liquid dye? I've used Spectrum Colors Red and I was very happy with it. However, I used it to make heart wax melts. It isn't quite the color of McIntosh. Since this type of apple generally is red and green, have you considered adding a little green to the red and trying to do a color variation of red, red/green and green? However, I'm not sure how well this would work in a candle if this is what you're making. I've only attempted variations in melts.
Since the black produced a more purple color, I'm wondering if using a little purple with the red would produce a closer color to the apple. Hopefully, someone will have a better suggestion.