No need to orz; those dojinshi manga were what really jacked ComiPa up for me and got me started fanficcing it. ^_^
"Malow tea" is a misspelling; whenever I googled the phrase, I got linked back to the ComiPa manga somehow. I went in under "'mallow tea' blue" and got some links back. A health food place sells the stuff but it didn't say anything about its color, just how great it is for realigning your chi and all its benefits and stuff. Some links to pages about traditional Chinese medicine, another about extracting dye from the tea. However, from Google's cache of http://www.city.yokosuka.kanagawa.jp/e/hananokuni/shop/01.html (The page itself didn't have any info), I found this:
"#
# Peppermint tea (the menthol aroma clears the head)
# Mallow tea (an enticing blue color that changes to pink when lemon is added)
# Lemon verbena tea (a faint citrus fragrance and nerve-soothing effect)"
I found another page that directly referenced the color change of mallow tea, http://homepage3.nifty.com/k_tomita~s/romarin/r-e/KOBO/tea.htm. Pics at the bottom are really nifty.
I may just order some and try it.