Related for Menachot 82:4
אמר רב נחמן בר יצחק לא קשיא כאן בטלית בת ארבעה חוטין כאן בטלית בת שמונה חוטין
Our Rabbis taught: In a garment that is entirely blue [threads of] any colour fulfil [the precept of zizith] except imitation blue.<span class="x" onmousemove="('comment',' For the fringe must consist of two colours, threads of real blue and threads of another colour (usually white) . Hence it is not permitted to have a fringe of real blue and imitation blue since they are both the one colour.');"><sup>4</sup></span>
Shulchan Arukh, Orach Chayim
The number of the Tzitzit threads on all corners is 4 strings folded over, which is 8. If more were added, they are invalid. You should trim the tips of the 4 threads then insert them in the corner. Finally, double them over and then there will be 8.
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