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out of interest what stops you using turmeric instead of yellow colour? I'm sure 1.5 to 2 tsp would be same colour result, is it taste thingy?
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Combination of experience and advice / suggestions on here that turmeric can add a bitter taste. Not totally convinced on that as 1. I have used turmeric before and 2. The amount would be very minimal to the quantity of rice.
Do you use powdered or liquid food colouring? By the vibrancy of the colours, I'm guessing powdered.