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Beetroot Red Food Colouring (Betanin, E162)
Beetroot's colour, betanin, is a permitted food dye (E162) with no safety concerns. It is bright bluish-red in slightly acid liquids and turns blue-violet, then yellow-brown, as they become alkaline, so a few drops colour icing, drinks or the water in a flow experiment.
The picture: a cut beetroot, coloured by betanin.
初学者
An hour
说明
1
1
Chop and steep
Chop and steep
Peel and chop the beets small and just cover them with water in a saucepan.
此步骤所需材料：
甜菜根500 克
水300 毫升所需工具：
刀
高壁炖锅2
2
Simmer gently
Simmer gently
Simmer gently for about 15 minutes until the water is deep red. Do not boil hard.
所需工具：
高壁炖锅
电热板3
3
Strain and reduce
Strain and reduce
Strain through muslin, squeezing the pulp, and simmer the liquid down to about a third for a stronger colour.
所需工具：
滤用棉纱布
碗高壁炖锅电热板4
4
Bottle and keep cold
Bottle and keep cold
Bottle it and keep it in the fridge. Keep it away from alkaline mixtures such as baking soda, which turn it brown.
所需工具：
带塞玻璃瓶
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