The topping will not turn golden in color; it will remain the same shade as it was before baking. (detoxinista.com)
Lower the heat to a simmer and simmer for about two hours or longer, until the upper foamy layer of the butter turns golden in color. (golubkakitchen.com)
Add asafoetida, chana dal, urad dal, sesame seeds, whole dry red chilies broken into pieces, mix well and let it cook for few seconds till the dals turns golden in color. (ticklingpalates.com)