Talmud for Menachot 84:14
רבי יוחנן בן דהבאי אומר אפילו מראה שני שבה כשר משום שנאמר (ויקרא יד, ד) ושני תולעת
So R'Hanina B'Gamaliel. But R'Johanan B'Dahabai says, Even the second dyeing<span class="x" onmousemove="('comment',' I.e., even though something else has already been dyed with this dye. ,gku, hba ,gku, hba');"><sup>22</sup></span> is valid, for it says, And scarlet.<span class="x" onmousemove="('comment',' Lev. XIV, 4. Heb. is interpreted as 'the second use of the scarlet dye'. And so it is too with the blue dye.');"><sup>23</sup></span>
Tractate Tzitzit
If one finds blue [threads], even though they are twined,30As zizith are. they are invalid, since the blue [for zizith] may be bought only from a reliable person.31Or, ‘expert’, who knows that only ḥillazon blue may be used.
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