NeutralizationBlock

public class NeutralizationBlock extends Block
{
    public NeutralizationBlock()
    {
        super(Material.IRON);
        this.setUnlocalizedName("neutralBlock");
        this.setCreativeTab(CreativeTabs.BUILDING_BLOCKS);
        this.setResistance(5.0F);
        this.setHardness(5.0F);
        this.setLightLevel(0.5F);
        this.setHarvestLevel("pickaxe", 1);
    }

    /**
     * This method will check whether or not the block has been collied with vertically. If so, it will remove all of
     * the potion effects the player has.
     */
    @Override
    public void onEntityCollidedWithBlock(World worldIn, BlockPos pos, IBlockState state, Entity entity)
    {
        if (!(entity instanceof EntityPlayer))
        {
            return;
        }

        EntityPlayer player = (EntityPlayer) entity;

        if (!player.isCollidedVertically)
        {
            return;
        }

        else
        {
            player.clearActivePotions();
        }
    }
}