Just been trying out my new Hipolito 350. It's Danish civil defence or something. Anyway it started first time. Each and was running nicely but after a while it started to pulse and yellow flame coming out of the top. Black mantle disease as well. It had plenty of pressure in it and I operated the pricker a good few times. I have never had any experience with this type of lamp before so looking forward to hearing some tips to get it working well.