A relatively simple way to "corral" solder is to use White Out
liquid. You can use the little brush to paint in the containment
area, then place your accent in the unpainted area. Be absolutely
sure to get the White Out that is NOT FLAMMABLE. I use this instead
of yellow ochre, which should also serve the purpose. Tin the accent
with a tiny bit of solder to reduce flow as well.
Hope this helps,
Judy in Kansas, where some very welcome rain is falling. Yay! The
strawberries and asparagus are lovin' it.