Почему флюс RMA-223 с Алиэкспресс плохой

I bought RMA-223 flux here: https://goo.gl/cB7j7b ; from other sellers: https://goo.gl/21kSxi I bought NC-559 flux here: https://goo.gl/KZ0VnD ; Other sellers: https://goo.gl/9I7CRC Tools and consumables in the video (expand the description): Soldering station with T12 tips: https://goo.gl/k0dXVj Soldering station assembly:    • Самодельная паяльная станция на жалах Hakk...   0.8 mm solder 100g with flux: https://goo.gl/eS08TV Flux dispensers: https://goo.gl/0L6EOl Mounting boards: https://goo.gl/wNsf7c ------------------------------------------------------------------------ My second channel: https://goo.gl/NNjMrt Our VKontakte groups: https://vk.com/remonter_org (share experiences and ask questions here) https://vk.com/radioproducts (Here I post links to the tools and consumables that I use)