Dear chef The yellow raw bananas are yellow only .it looks greenwhen u cut u can see its yellow from inside its available in kerala mumbai and all over south .in market its known as suurti kela .it can be deep fried in any cooking oil for traditional taste it has to be deep fried in coconut oil .
For yellow banana wafers "Surti Bananas" (kerla bananas) are used. Banana is little yellow in color and after frying it fully turns yellow like market chips.
Thanks for uploading the video however the quality of chips weren't great as compared to what we purchase from the shop or we get from the wraps. What I've observed is banana weren't peeled properly, so whence fried the texture at the corner was apparent.