Lava Rocks have a multitude of different uses, the can be added to PVA Bags or PVA stocking they can be put in the middle of groundbait balls or they can be cupped directly into the swim, this is especially productive when fishing the margins.
They are available in 5 standard colours to suit a variety of fishing situations:
Black (unflavoured) is particularly effective in winter when the water is clear, or on lakes that have lots of silt
Red (unflavoured) is one of the most powerful colours, it stands out in different water conditions.
Green (unflavoured) is excellent when used in conjunction with green groundbaits
Yellow (unflavoured) is the brightest of the standard colours and stands out well against a dark lake bed
Chocolate Orange is a great colour when fishing commercials, the bright colour stands out well.