color lerp result is not right

[user_3efc87921bcb4110447d2e17e4d7044ea0722e55da9367bcdafdd8 (老子爱叫啥就叫啥)]

i’m trying to lerp 2 colors to create some fog like environment, and here is my post processing material for test.

and here is the result

tell u the truth, i think the result color should be something around green, but what i get is absolutely white.
i check my logic several times, can not find anything wrong.

anyone helps, thank u very much

[Extrone (Arjun Subhash)]

You’re lerping the alpha channel of each colors. Use the top output pin instead of the bottom one to mix colors.

[user_3efc87921bcb4110447d2e17e4d7044ea0722e55da9367bcdafdd8 (老子爱叫啥就叫啥)]

thank u very much