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Silicon Oxide Colours

An overview of the various colours that are associated with the thickness of a SiO₂ layer and various silicon nitride. It probably also works for other transparant materials. You than have to adjust the thickness by dividing the value for SiO₂ by the refractive index of SiO₂, and then multiplying by the value of the refractive index of the new material. e.g.:

d_x = d_SiO2 *n_x /n_SiO2

material	n_f
SiO₂	1.46
Si₃N₄	2
Stress free Nitride	2.24

Colour as a function of thickness

Order	SiO₂ µm	Si₃N₄ µm	low stress nitride µm	colour
	0.050	0.036	0.024	tan
	0.075	0.055	0.035	brown
	0.100	0.073	0.047	dark to red-violet
	0.125	0.091	0.059	royal blue
	0.150	0.109	0.071	light to metallic blue
I	0.175	0.127	0.083	metallic to very light yellow-
	0.200	0.146	0.095	light gold to yellow-slightly metallic
	0.225	0.164	0.106	gold with slight yellow-orange
	0.250	0.182	0.118	orange to melon
	0.275	0.200	0.130	red violet
	0.300	0.218	0.142	blue to violet-blue
	0.310	0.226	0.147	blue
	0.325	0.237	0.154	blue to blue-green
	0.345	0.251	0.163	light green
	0.350	0.255	0.166	green to yellow-green
II	0.365	0.266	0.173	yellow-green
	0.375	0.273	0.177	green-yellow
	0.390	0.284	0.185	yellow
	0.412	0.300	0.195	light orange
	0.426	0.310	0.202	carnation pink
	0.443	0.323	0.210	violet-red
	0.465	0.339	0.220	violet-red
	0.476	0.347	0.225	violet
	0.480	0.349	0.227	blue-violet
	0.493	0.359	0.233	blue
	0.502	0.365	0.238	blue-green
	0.520	0.379	0.246	green (broad)
	0.540	0.393	0.256	yellow-green
III	0.560	0.408	0.265	green-yellow
	0.574	0.418	0.272	yellow to yellowish
	0.585	0.426	0.277	light orange to pink borderline
	0.600	0.437	0.284	carnation pink
	0.630	0.459	0.298	violet red
	0.680	0.495	0.322	blueish
IV	0.720	0.524	0.341	blue-green to green
	0.770	0.561	0.364	yellowish
	0.800	0.582	0.379	orange
	0.820	0.597	0.388	salmon
	0.850	0.619	0.402	dull light red-violet
	0.860	0.626	0.407	violet
	0.870	0.633	0.412	blue-violet
	0.890	0.648	0.421	blue
V	0.920	0.670	0.435	blue-green
	0.950	0.692	0.450	dull yellow-green
	0.970	0.706	0.459	yellow to yellowish
	0.990	0.721	0.468	orange
	1.000	0.728	0.473	carnation pink
	1.020	0.743	0.483	violet-red
	1.050	0.764	0.497	red-violet
	1.060	0.772	0.502	violet
	1.070	0.779	0.506	blue-violet
	1.100	0.801	0.521	green
	1.110	0.808	0.525	yellow-green
VI	1.120	0.815	0.530	green
	1.180	0.859	0.558	violet
	1.190	0.866	0.563	red-violet
	1.210	0.881	0.573	violet-red
	1.240	0.903	0.587	carnation pink to salmon
	1.250	0.910	0.592	orange
	1.280	0.932	0.606	yellowish
VII	1.320	0.961	0.625	sky-blue to green-blue
	1.400	1.019	0.662	orange
	1.450	1.056	0.686	violet
	1.460	1.063	0.691	blue-violet
VIII	1.500	1.092	0.710	blue
VIII	1.540	1.121	0.729	dull yellow-green

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Silicon Oxide Colours

Colour as a function of thickness

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