Good day, I really need some experts clarification on issues I have with soldering. Still trying to master it. some times it goes flawless with metal melting so lovely (I love this moment) some times I have solder burning and getting dark but not melting I attach picture. What can be wrong there? I have hard and medium solder purchased from cooksons. I am starting with low tems and moving ard and then slowly increase. some times I have metal bright red but solder not melting at all!!!! :Click image for larger version.  Name: IMG_2499.JPG  Views: 31  Size: 51.5 KB  ID: 11505Click image for larger version.  Name: IMG_2496.JPG  Views: 31  Size: 50.9 KB  ID: 11506(|
thank you !