Gets confusing as I think the "clear" shellac can is the same color as the spray.  
in my experience, the spray can is really clear (light blonde) and the can is an amber. I prefer the spray just because no mixing and it's always ready.

Ron,
It has changed over the years.
Last can I bought is this:


And other times I have used this:


Every store has had them in amongst the paint and finishing stuff.

Everclear is pure, but $$$$$

The denatured alchohols are usually a mix of various stuff, but all have worked well.
The pharmacy stuff always has some glycerine mixed in which can't be good, but then again it really takes a high percentage of these things to mess things up.

Finishing is always the thing that gets rushed since you are at the last step before calling it done.
If you have an air compressor, spraying is the best for large surfaces. The $9 spray gun (with coupon) from Harbor Freight (purple) is quite a bargain and cheap enough to toss away versus cleaning 😬