Put 250 cc of juice into a small pot, warm it and add Stone Sugar.

Stir with a whisk until the sugar dissolve. Then turn off the gas

Add the gelatin powder and stir with a whisk.

There would be some bubbles there. Take them out.

Then put the pot into water, cool it down.

If it has cooled down, put the jelly into 8 tall glasses.

Put the glasses into the refrigerator. Wait until it harden.

Repeat the same process with the different colours.