Visual system Detection method Safety Positive reaction Negative sample Need to UV ray Stability Cross contamination Use time
Magnesium pyrophosphate Visual Yes Turbidity No turbidity No 5-10 seconds No Before the amplification
Ethidium bromide Visual No Yellow No color Yes 2 weeks Yes After the amplification
SYBR green (ii) Visual Yes Green Red Yes 1–3 days Yes After the amplification
Hydroxynaphthol blue Visual Yes Sky blue Violet No 2-3 weeks No Before the amplification
Genefinder™ Visual Yes Green Red No 2-3 weeks No Before the amplification
Table 3: Comparison of colorimetric assays together.