The signs of Fourier coefficients of certain eta quotients are determined by dissecting expansions for theta functions and by applying a general dissection formula for certain classes of quintuple products. A characterization is given for the coefficient sign patterns for \ (qⁱ;qⁱ) _ (qᵖ;qᵖ) _{} \ for integers \ (i > 1 \) and primes \ (p > 3 \). The sign analysis for this quotient addresses and extends a conjecture of Bringmann et al. for the coefficients of \ ( (q²;q²) _ (q⁵;q⁵) _^-1 \). The sign distribution for additional classes of eta quotients is considered. This addresses multiple conjectures posed by Bringmann et al.
Huang et al. (2025) studied this question.