Gosh! Look at the amount of yellow dye they put on dried longan skin!

My hands were a bit wet when I touched some dried longan and I was shocked to see that my hands had turned yellow from the colouring they put on the skins! Then I soaked the dried longan in water. The soluble yellow dye made the water yellow. I changed the water for around 10 times and the water still turned yellow from the dye.
I wonder how much yellow dye they used to colour these dried longans? I hope is is food grade dye and nothing poisonous!
Gosh, these are some of the things they do to make food look attractive! We have to be careful of the food we consume nowadays!