OK, I researched the web a bit. Argentineans refer to the color of the blue stripes as "celeste". To them it represents the color of the sky. there was still no conclusive answer to the exact hue, but here's some samples:
quote:
"The colours of Argentina's flag are subject to discussion, and there is no official position on colour usage. The Spanish word celeste (cerulean blue) is used to describe the colour of the blue stripes. Cerulean blue's is defined by Pantone as N21-01, which equals "155, 196, 226" in RGB notation."
quote:
"Celeste" is spanish for "of the sky" (as in “sky-ish”).
António Martins, 25 Sep 1998
Argentines call the main colour of their national flag celeste (that is colour of the day sky at the normal angles of sight). Followers of the Partido Justicialista prefer cyan (a mix of blue and green, ), those of the previous Unión Cívica Radical government preferred whitish blue (). Anything in between is also acceptable, but saturated blue () definitely not.
Gerardo W. Fischer, 22 Jun 1996
Blue and sky blue were used indistinctly until the Decree no.10302 of April 24th 1944 which defined it as «blue as clear as the sky» [great!]
Santiago Dotor, 15 Jun 1999, translating from this website
The shade is Pantone 290, even though many use 297 instead since 290 results too ligh sometimes. It's a matter of finding out the situations when it is used. (This is not an official specification: It was fixed by me, Whitney Smith and Peter Orenski, comparing several flags of silk, canvas, polyester, etc. that I had gathered, along with the illustrations that come with the official argentine bulletins.)
Gus Tracchia, 04 Feb 2000, translated by António Martins
“Approximate“ (i.e. not official) shades (both Pantone und CMYK) given in the Album 2000 [pay00]: Pantone CMYK
Blue 2975c 40-0-0-0
Yellow 116c 0-10-95-0
Santiago Dotor, 26 Feb 2001
A reccomendation of this Academy (1997.04.09), to answer an query from the Chancelry, about the color identification in the Pantone scale, specifies that: «according to it will be chosen from the sampler "Pantone Color Formula GUIDE" the colors Pantone 298 C or Pantone 2995 C which are approximates of the blue shade that corresponds to our flag. Naturally, depending on the quality, texture and kind of surface (dull or bright) there will be visual variations in color perception, but those given above seem to be quite approximative to the requested identification.»
Néstor Poitevin (Argentine History Academy), 20 Aug 1999, translated by António Martins
These Pantones reccomended by the History Academy seem too dark to me, and they dont fit the (later) official law about the colors: Cielab L’ 64.35 a 7.02 b 29.17 C 30.01 H’ 256.47.
António Martins, 11 Oct 1999 and 15 Nov 1999"
Pantone 290 or 297 seems to be a good call Phil.
Below is Argetina's flag.