Asterion offers a high performance matte acid tin process which produces a highly uniform and pearlescent deposit. The single component system is economical and easy to use. A rapid plating rate produces uniform results over a wide range of current densities. The brightener allows many substrates to be processed in the same bath. The same process may be used in both rack and barrel operations with similar results. The deposit exhibits superior solderability and may be re-flowed into a bright finish.