When casting a touch spell, I can leave the spell on my hand and deliver strategically. What happens when that same touch attack is enhanced with Reach metamagic? Lets say I cast Invisibility on an ally 30 feet away.
Did it leave a 'glamer sparks' along its path? Did it become an energetic projectile with explosions, or does it still behave like the original touch (except for the fact that it is now moving along a vector).
Assume that myself and my ally are concealed and hidden to the public (assume all my verbal and semantic components were executed unnoticed, so they didn't notice a creature lurking in the bushes), but my ray had to pass across a wide open roadway. Did the approaching carvan even have a chance to see anything? Do they get a spot check (to notice dancing lights or something like that)? (in my mind i am comparing to an Orb of Fire, where a bright flash of fire is likely to turn some heads).
The main idea is that I am well hidden in some bushes, and do not want to divulge my location, yet I want to deliver certain buffs to my rogue across the street.
My real confusion is regarding the "sparks and crackles" produced from this ranged-touch spell. Does the Invisibility happen silently, like it normally would as a touch, or is it preceded with a loud zap and bursting streak of light (like most rays do)? Is the caravan alerted to our presence, even if they can't find us; or do they have no clue about the suspicious happenings in the bushes just ahead.
Reach Spell: […] The spell effectively becomes a ray, […]
Effectively? I assume they were implying that mechanically it is a ray. But then how come they didn't simply say "spell becomes a ray". If the "Reach-spell" is effectively a ray, what exclusion is preventing it from being specifically a ray.
P.S. If Invisibility is not a good example of a touch spell turned range (for whatever reason), then how about the same scenario with Eyes of the Avoral. Or rather, a spell that wasn't "flashly" in its touch form (it does not give off any normal illumination, even in a completely dark room).
Best Answer
As I see it, there are two basic parts to this question: can you hold the charge on a Reach spell, and is the 'ray' made by a Reach spell visible?
To the first question: You cannot hold the charge on a Reach spell. A Reach spell is a ranged touch attack, and the rules for holding the charge specifically call out touch attacks, which are different. The relevant rules are:
Since that passage only mentions touch spells, and not ranged touch spells, you cannot hold the charge on a Reach spell.
To the second question: Whether or not you can stealthily cast a Reach spell is pretty much entirely up to your GM. The description of Reach Spell says that the affected spell "effectively becomes a ray", which says to me that for all intents and purposes, you treat the spell like a ray.
The fact that it says "effectively becomes a ray" and not "becomes a ray" is a semantic difference that has no real meaning. There are no exclusions listed for why it says one and not the other, so it's likely that whatever designer wrote this feat liked the sound of "effectively" more than not, and his/her editor agreed. Since the feat doesn't list any ways that the spell doesn't work like a ray, it's a reasonable assumption that it always works like a ray.
If your GM says that Reach Spell rays are visible, then they are. The rules aren't terribly clear on whether rays in general are visible, but clues from flavour text and descriptions strongly imply that ray spells are visible to normal vision, and thus can be seen by anyone who is looking.