Indicator inks, indicators formed by printing or otherwise utilizing the inks and host products utilizing the indicators are disclosed. Pressing a finger against the underside of the tape allows the user to create a drag brake that acts against the retraction spring to slow andor stop the retraction of the tape blade. The fuel injector may also include a control fuel inlet that is separate from the injection fuel inlet port. The radiation passes the contamination barrier once before hitting the collector and a second time after reflection by the collector. In one embodiment, the first message is a SIP OPTIONS message communicated from the mobile device to the access guidance component. The systems of the present invention generally comprise an injection means for continually injecting a fluid into the subterranean formation, and a pressure pulsing means for periodically applying a pressure pulse having a given amplitude and frequency to the fluid while the fluid is being injected into the subterranean formation.