Indeed, these flame test colours are the most common way of identifying them since all their salts with common ions are soluble.
ˌɪndˈiːd, ðiːz flˈeɪm tˈɛst kˈʌlɚz ɑːɹ ðə mˈoʊst kˈɑːmən wˈeɪ ʌv aɪdˈɛntᵻfˌaɪɪŋ ðˌɛm sˈɪns ˈɔːl ðɛɹ sˈɔlts wɪð kˈɑːmən ˈaɪɑːnz ɑːɹ sˈɑːljuːbəl.